“I want to see you really put your hips into it, Jenna. Give it all you’ve got.”
    With an undignified grunt, Jenna swung the racket to return the serve. She couldn’t believe she was playing tennis two days in a row, and her sore muscles were protesting loudly. At least this time Trish wasn’t being as cruel and merciless. Today she was taking things slow, going way under her abilities to give Jenna half a chance at playing. Or maybe more like a quarter.
    She also kept shouting out encouragement and advice on her form. Jenna could tell that Trish would make a great coach, although she prayed this wouldn’t be a regular thing for them now. The last thing her habitually lazy ass needed was to take up sports.
    And yet, though she hated to admit it, Jenna was actually having fun. Sure, the physical activity sucked and the soreness from yesterday sucked more, but things between her and Trish were back to normal. Or at least the normal she preferred now that the collar was working again. Trish was kind, caring and more than accommodating. It was exactly the relationship they both said they wanted.
    There was only one wrinkle to their stepmother/stepdaughter quality time.
    Jenna swung the racket awkwardly and sent the ball bouncing off to the sidelines. Before she could even make a move to get the ball herself Trish ran off sprinting after it with an unusual amount of glee.
    “Don’t worry, Jenna! I’ll fetch it!”
    An electric shiver surged through Jenna watching Trish happily diving for the ball. Just because Trish was doing it on purpose to embarrass her didn’t make it any less hot. Trish had been making the same dumb joke every time she chased after the ball. And the worst part was the knowing smile she’d throw Jenna’s way as she proudly held up the tennis ball.
    Obviously it was Trish’s way of paying her back for treating her like a dog. To her stepmom it was nothing but petty revenge. Except to Jenna it was a torturous reminder of what the collar could allow her to do. A few simple commands and Trish would be back to being a dumb, happy dog under her control.
    Jenna had no choice but to weather her stepmom’s jokes. She just wished it wasn’t so hot to picture her as a pet. Why did the moral choices have to be so frustrating and unsatisfying?
    “Oh come on, don’t look like that.”
    She’d been lost in her jumbled thoughts. Jenna looked up and found Trish leaning against the net, the position and her low-cut top putting Trish’s perky tits on full display. She quickly looked away, certain it had to be unintentional on her stepmom’s part. Jokes about Jenna using her like a dog were humiliating, but there’s no reason Trish would try to make Jenna look at her tits. Right?
    “It’s just a little teasing,” Trish assured her.
    “I know. I know. I deserve it.”
    “I thought you’d enjoy watching me fetch the balls. Instead of what you had me fetch last time,” Trish added with a rye smile.
    Jenna gulped. The memory of Trish crawling naked across the floor to pick up her soaked panties off the floor with her mouth had been burned into her brain forever. As hot as that memory was, now it was just burning her up with embarrassment.
    It’s not like she could explain to Trish that she didn’t expect her to remember any of it. Or that she could easily use the collar to recreate that scene. Jenna stared at the collar snugly around Trish’s neck, already subliminally rewiring her stepmom’s brain. Would it take a few days before Trish would happily strip and crawl and bark like a happy sex pet like before? Or was the conditioning still there, charged up now and ready to be exploited?
    Jenna squirmed and tried to push the thoughts of taking advantage of Trish out of her head. It was just some teasing, which she certainly deserved for what she’d done.
    “It’s alright, Jenna,” Trish finally said, standing up straight and taking some mercy on her. “You put that night behind you, so we don’t have to talk about it again. Right?”
    “Right, Trish.” It was totally behind her now. Totally.
    Trish beamed. “And wasn’t playing together fun? We should do this more often.”
    “I’d prefer we find a hobby that’s a little less physical,” Jenna groaned back, toweling the dripping sweat off her face.
    “Come on, it’ll be good for you.”
    Jenna reflexively braced herself for a comment about her weight. But to her surprise Trish looked her up and down with what she swore was a hungry smile.
    “I’m just saying, if you put on some muscle… I think you’d look really sexy.”
    Was that the kind of thing a stepmom was supposed to say?
    “Anyway you did great. Go hit the shower and I’ll fetch our stuff.” Trish clapped a hand over her mouth and giggled. “That one was an accident, promise.” Then she spun around and bent over at the waist to pick up a ball off the court. The pose pulled her tiny tennis skirt up and gave Jenna a flash of her white panties.
    She’d been gulping down some much needed water and immediately began to choke on it. She was still coughing up water as Trish straightened up and smile innocently at her.
    Jenna stumbled away from the tennis court horny and confused. That must have been an accident, right? It’s not like Trish would deliberately flash her. Teasing Jenna for being a pervert was one thing, but some of that almost felt like flirting.
    Then a worse idea struck her. What if this was the collar affecting Trish? Internally Trish could still be pissed about Jenna using her like a dog, but the collar charging her libido and desire to please could twist things all around. Passive aggressive teasing becoming sexy teasing?
    Jenna wasn’t sure which was worse. All she could focus on was the gnawing thought that if the collar was already affecting Trish then she could already be susceptible to manipulation.
    A few commands and Trish would forgive her. And be her dog again. And do every depraved thing Jenna could dream of.
    Jenna ran into the showers and stripped fast, plunging into the cold shower immediately to damp the heat inside her.

~ ~ ~

At least she was looking forward to this part of the day. After their heart to heart Trish insisted that they go back to the mall and return the unflattering clothes she’d forced on Jenna. She even insisted on buying her something nice to make up for it, even though it was supposed to be Trish’s birthday. But if she was feeling like indulging Jenna then she wasn’t about to protest. And thankfully the teasing dog jokes had stopped.
    Jenna turned back and forth before the mirror, inspecting the way the outfit complimented her figure. This was much more her style. And if she needed any more confirmation it was seeing Trish’s face light up as she stepped out of the dressing room.
    “Jenna! You look amazing!”
    “Thanks,” she mumbled, her cheeks burning. She’d wanted to strut out and show Trish how she should be dressed confidently, but the sincere appreciation caught her off guard. She reasoned it could just be the collar giving Trish puppy dog enthusiasm again, and yet having a gorgeous woman like her gushing over how good she looked still made Jenna blush.
    “We’re definitely getting this outfit for you too.”
    Much as she loved how she looked, Jenna’s guilt was starting to gnaw at her. Letting Trish buy her a new outfit was one thing, but this was the third outfit Trish insisted on getting for her. And even an admittedly spoiled girl like Jenna winced at the price tag.
    “It’s your birthday, remember? You really don’t have to-”
    But Trish cut her off with a swift wave of her hand. “I insist. I have to make up for those awful clothes I tried to force on you yesterday.”
    “They weren’t that bad,” Jenna said with no conviction. The truth was she felt nothing but relief when they returned everything. They had all been too tight and unflattering, practically designed to make her self conscious about her weight. But that had been the old Trish’s doing. It was enough having the new happy Trish back. She didn’t need her blowing a ton of money on admittedly fantastic looking clothes for her.
    As she was debating the ethics of her slightly brainwashed stepmom buying her clothes, Trish suddenly took her hand and grabbed her attention. Her face was filled with shame and her lip quivered as she spoke.
    “The truth is I was trying to make you feel ugly and awful yesterday. I was trying to punish you but that’s no excuse for how I acted and what I put you through.”
    “I did deserve to be punished,” Jenna admitted, knowing Trish was oblivious to just how much Jenna had done.
    Except Trish shook her head. “No, that still doesn’t excuse it. I treated you the same terrible way my parents treated me.”
    That shocked Jenna. From the few times Trish brought them up her parents had sounded like glowing supporters of their athletic daughter.
    “When I was a kid they constantly humiliated me if I gained any weight. They pushed me to exercise constantly and sacrifice everything to be their little champion. So when I wanted to hurt you I used the exact same method they did to make me feel like shit. You don’t deserve that.”
    Jenna didn’t know what to say. Even when the collar had made them get along better Trish had never opened up like that. It was a real pain that Jenna knew herself. So without a word she wrapped Trish up in a tight hug.
    “Thank you,” Trish said when they pulled apart. She wiped away a tear. “I promise I won’t ever try to treat you like that again. It’s only going to be appropriate punishments when necessary from now on.”
    “That sounds more than fair.” They shared a laugh together and another quick hug. Given how small the age gap between them was Jenna still didn’t think she could really see Trish as a mother figure, but it felt like they’d gotten a little closer to being something like family.
    “Your parents sound like assholes by the way.”
    A quick flash of fear washed over Trish’s face. Just how deep did that trauma go? Then she forced herself to laugh. “They really were assholes. I don’t mind being athletic now that it’s my choice, but they had no right to treat me like that. Who knows? Maybe I could have kept on some weight and looked as sexy as you do.
    Jenna blushed as Trish clapped her hand over her mouth. “Shoot. Don’t think it’s appropriate for me to call you sexy.”
    “You already did earlier at the court.”
    “Doesn’t sound like me,” Trish retorted, then clearly changed the subject. “Let’s go check out and get some lunch.
    Jenna rolled her eyes but was smiling. This is who they could be together. Actually kind and supportive to each other. She just had to give up those perverse desires of humiliating Trish into her sex pet.
    Despite her noble intentions Jenna still found her eyes instantly drawn to Trish’s ass as they walked towards the counter. The way she looked sewn into those tight pants was hypnotic. Maybe it was being in the store again, or the thoughts of humiliating Trish, or how hot Trish’s ass looked, but Jenna found herself remembering yesterday’s revenge fueled fantasy.
    “You’ve got that look again.”
    Jenna snapped out of her horny thoughts to find Trish glaring at her, eyes narrowed with suspicion. 
    “It’s nothing,” she replied with guilt all over her face.
    “It’s my birthday, remember? You promised to do anything I said.”
    Jenna shamefully nodded.
    “Then tell me the truth.”
    “Oh god. I just…” Jenna sighed. “I was thinking about forcing you to wear a super short skirt so you’d be flashing everyone your ass like a slut.”
    “Well that’s awfully specific.”
    “It was an idea from yesterday! You were making me wear all those ugly clothes and I just wanted to get some revenge. I just happened to remember it and it’s not something I’d do. We already made up, so let’s just forget it.”
    “I guess I understand why you’d feel like some payback.” Trish looked away, her cheeks red. Jenna could only imagine what kind of pervert she thought she was. And just when they were getting along she had to go and make it weird.
    “How about I take care of the clothes? You can go to the food court to get lunch and I’ll meet you there.”
    “Sure, Trish.” Jenna walked away mortified. Obviously Trish wanted her to go and cool off. Why had she gone and told her the truth?
    Because Trish had opened up and confided in her. It seemed only fair, but now she’d only confirmed what a perv she was to her. 
    A few minutes later Jenna sat down with her food, resolved to make it up to Trish. She’d shut down her libido completely. Fully chaste stepdaughter with no impure thoughts at all. She’d be a totally respectable young lady.
    It felt like an impossible task, especially with the collar around Trish’s throat. Jenna had no choice but to leave it charged on her so that Trish would be happy, except it made it so tantalizingly easy to take advantage of her. Why did she have to have such an amazing temptation in her life? How was she supposed to resist having a pet like Trish at her command?
    She would simply have to find a way to power through. Jenna took a sip of her drink as she spotted Trish heading towards her with shopping bags dangling off of her arms. Then she noticed what Trish was wearing and spat out her drink.
    Though she had the same top on, Trish had swapped out her tight pants for a tiny black skirt that was barely more than a belt. Her toned legs were on full display and everyone she passed were doing double takes to stare at her ass.
    “You’ve got to be fucking kidding me.”
    “That burger looks great,” Trish said nonchalantly as she dropped the bags down in the chair beside Jenna.
    “Trish, the fuck?”
    “What do you mean?” she answered innocently, cocking a hand on her hip. As Trish shifted Jenna swore she could see her panties under the skirt already.
    “The skirt.”
    “Oh this? I saw it and just had to have it.” Trish laughed as she gave a spin. The slutty skirt was straight out of Jenna’s fantasy, and sure enough it flashed more than enough cheek. As Trish twirled her arm accidentally knocked over one of the bags. “Oops, I’ll get it.”
    And then, in front of the entire food court, Trish bent over at the waist to retrieve the bag. Time slowed for Jenna as the tight skirt slid up and flashed the cute thong that Trish was wearing. The quick flash of white underwear at the tennis court couldn’t hold a candle to this. Her whole ass was on display right in Jenna’s face. Had she changed into a slutty thong just to expose herself as much as possible?
    Cheers and whistles rose up behind her and snapped Jenna out of the mesmerizing sight. It must be the collar. It must have fucked with Trish’s head more than she thought.
    When Trish straightened up she smiled pointedly at Jenna. “Well? Was it everything you fantasized about?”
    Jenna’s jaw dropped. She’d made a slutty spectacle of herself just to tease her? Was this more payback? Or the collar? Jenna didn’t know. Her body was shaking with pure horny need and confusion.
    In her panic she snapped. “Go put your pants back on, Trish!”
    There was a flicker of surprise and then Trish broke into a smile of pure delight. “Of course, Jenna. Be right back!”
    She snatched up one of the shopping bags and rushed out of the food court. Men and women were craning their heads to try and get a last look at her ass as she left. Including Jenna, whose eyes never left Trish’s rear until she vanished from sight. As soon as she was gone Jenna melted into the chair, running a hand over her face as she tried to fight down how horny she felt.
    And in her shame and arousal Jenna realized what she’d accidentally done. She’d given Trish a command telling her to put her pants on. And Trish had run off happily to obey her. Had putting the skirt on to make Jenna’s revenge fantasy a reality been a result of Trish trying to obey Jenna’s wishes too?
    “That collar is going to be the death of me,” Jenna groaned in her seat.

~ ~ ~

When they got home Jenna rushed upstairs and got herself off three times trying to work out the horny frustrations of the day. The fantasies all blurred, largely involving ideas of Trish crawling across the tennis court on all fours chasing balls, or Jenna spanking Trish's ass with a tennis racket as she happily barked, and even a blank, oblivious Trish dressed up in slutty outfits as Jenna took her out to a club and did everything she wanted to her. All fantasies that would have been impossible two weeks ago, but now, as Jenna's aching libido knew, were all available to her thanks to the collar.
    But Jenna was determined to turn over a new leaf. No more mind control manipulation. She would do the respectful thing and masturbate to her hot stepmom in private. These horny thoughts were her problem to deal with.
    With her resolve steeled and her pussy satisfied, an exhausted Jenna dragged herself downstairs about an hour later. Thankfully she and Trish had a great dinner and talked about normal things. The weirdness of the day had vanished and Trish had finally stopped teasing her. Hopefully her spectacle with the slutty skirt at the mall had been her grand finale of embarrassing Jenna.
    The relaxed and comfortable vibe meant that Jenna's guard was down when Trish suggested they enjoy a movie. Jenna dropped onto the couch with a bowl of popcorn and immediately realized her mistake as Trish sat much too close and cuddled up right next to her.
    Trish smiled as she put an arm around Jenna's shoulder and hit play on the remote. “I saw this movie and thought you’d like it.” 
    ‘She's just being friendly,’ Jenna told herself, doing her best to ignore that an outside observer might think they were a couple having a movie date. Then the film started. It was about a sexy young reporter interviewing a hot older female athlete during a tournament. When they began making out and fingering each other within the first 30 minutes of the movie Jenna knew she was in trouble.
    Every time the actresses hooked up Trish would just seem to snuggle a little closer to her, pressing her toned muscular body against her. Her eyes would keep darting over to Jenna, no doubt hoping for a reaction.
    Then there were the little comments Trish would make. Not about the overt sexual nature of the film, but talking about the athletic training or her own experiences with tournaments. Totally normal commentary if it wasn't for Trish practically trying to climb into Jenna's lap.
    It was a game of ‘gay chicken’ and Jenna couldn't afford to lose. Trish had been teasing her all day, working her up, and now she was practically throwing herself at Jenna to tempt her into making a move. She realized it was all a test to see if Jenna would be good or if she would give in and try to fuck her again.
    But Jenna’s resolve was strong. Stronger than she thought, considering the gorgeous woman pressed up against her. And all the while the collar sat snugly around Trish’s throat, a bomb waiting to be set off. How many words would it take to leave Trish totally obedient?
    Jenna could get through this. She didn't need to control Trish. She didn't need to fuck Trish. She really, really fucking wanted to, but she didn't need it. 
    Jenna nearly lost it when the actresses fucked with a strap-on in the finale, finally declaring their love. Was this a sports film with racy sex scenes or a porno with a sports gimmick? But she kept her hands in her lap and a straight face for a horny lesbian determined not to fuck her stepmom. When it was mercifully over Trish peeled herself away and turned off the movie.
    Jenna felt ready to collapse. Somehow forcing herself to stay still while Trish cuddled her was more of a workout than playing tennis against her. Trish had a disappointed look on her face. She must have been certain that all this would tempt Jenna into breaking her promise. But why would she look that forlorn about it?
    “That was a fun movie,” Jenna finally managed to say.
    “Like I said, I thought you would like it.”
    Jenna started to get up from the couch when Trish suddenly turned to face her, a broad smile on her face. “How about a double feature?”
    Jenna already needed to get herself off to deal with the last movie. “I think I might be spent on lesbian sex movies.” she replied, something she thought she would never say.
    But Trish waved her hand and pulled a DVD out of a plastic bag. She must have gone out and bought it while Jenna had been upstairs masturbating furiously.
    “Don't worry,” Trish told her, “This one's a family film. Perfect for us to watch as a family.”
    Obviously this was a trap. Jenna knew it before she even took the DVD case. When she looked at the cover she couldn't stop the shocked weird noise that escaped her.
    It was a goofy older comedy called, ‘We Turned Mom Into A Dog!’ It featured a pair of distressed kids watching the family dog up on two legs, wearing an apron wrapped around its waist and pushing around a vacuum cleaner, while the cute actress playing their mom was on all fours with her tongue out, panting like she wanted to treat.
    “Oh come the fuck on!”
    “I thought you might like it,” Trish giggled, using a hand to poorly cover that same knowing smile she’d had all day. 
    “Okay, fine! I'm sorry I treated you like a dog! I'm sorry I got you naked! And made you bark and fetch my panties and eat me out! It was super fucking hot! But I know it was inappropriate, and I won't do it again. So can you please stop torturing me?”
    Trish looked at her, hurt and seeming to be at a loss for words. 
    “I promise I'll be good. You're my stepmom and I won't try and fuck you again. I actually enjoy hanging out with you, but I can't stand this teasing anymore. I'm just going to go.”
    Jenna stormed past the stunned Trish, handing her the family movie that was clearly somebody's fetish. Who was Jenna kidding? It was her fetish and Trish knew it, which made it all the more humiliating when Trish threw it in her face. She deserved some payback for using Trish like she did, but she was at her wit's end.
    That's when Trish shouted after her in a stern voice. “Jenna, you stop right there.”
    Jenna came to a stop with the deep sigh. Ready for the scolding she was due. 
    “It's my birthday and you said you would do anything I wanted, right?”
    “Yes Trish.”
    “Then turn around.”
    Of all the punishments Jenna imagined as she turned, the last thing she expected was to see Trish taking off her shirt. 
    “Trish?”
    Her stepmom just smiled, baring her tits to Jenna as she crooked a finger towards her. “Come here.”
    It was the collar messing with Trish's head. It had to be. But Jenna walked forward with slow steps. When she was close enough, Trish reached out and yanked her forward. Trish kissed her hard, moaning desperately into her lips. Jenna didn't kiss back and kept her hands to her sides. She still felt certain this had to be a trap.
    When Trish pulled away, she gave Jenna a serious look. “Yes, I've been torturing you today. Reminding you how you used me like a dog. I've been teasing you for being so horny for your stepmom. And I picked those movies to turn you on and try to make you make a move on me.” Then she pouted, a soft and wounded expression. “So why didn't you?”
    “Because you told me not to?”
    “And why would you pick today to start doing what I told you?” Trish reached up and ran a hand through Jenna's hair, making her shiver. “I can't stop thinking about how it felt. You telling me to strip and bark like a dog. Making me do it over and over until you were satisfied with it. It was humiliating and demeaning and I've never been that wet.”
    Jenna just stared, too dumbfounded for words. 
    “Sure, men have always wanted to fuck me. Women too. And some of even tried to be assertive in the bedroom. But nobody ever treated me the way you did. Nobody ever desired me that badly. The way you looked at me as I crawled around like your pet. Like I was the most beautiful thing in the world and you could hardly believe you had me. And it felt so good to be yours, too. You have no idea how exciting it felt to call you owner.”
    “Are you serious?”
    “I am. I know we shouldn't. What stepmom would want to do this? But even when I was so upset with you yesterday, I kept sneaking away to touch myself. I was so harsh on you because I was so certain that I should be ashamed of myself. I punished you as a way to punish myself, and I saw how wrong that was.”
    Trish slid a hand down to grab Jenna’s ass, pulling her in close. Jenna couldn’t help but shove her face against Trish’s tits. Who could resist this?
    “Today made it all clear. I’m done punishing you, and myself. I want you, Jenna. It's my birthday, and you promised to do what I want. So I say we enjoy ourselves and worry about the future later.”
    Jenna stared into Trish’s eyes. She wanted this. She was giving permission. Trish may not have known the whole truth, and Jenna couldn’t say how much of this was the collar manipulating her emotions, but Trish wanted to be her pet. Trish wanted to fuck her.
    It was all the excuse she needed to stop holding back. Jenna kissed at Trish’s tits, moaning her name longingly. When she looked up she saw Trish biting her lip, a look of pure lust on her face. No more resentment or anger or teasing. Only pure need. The same need that had been possessing her for weeks.
    Jenna kissed her stepmom and Trish kissed back passionately. She stroked Trish's cheek and loved the needy expression the older woman made as she nuzzled into it. 
    “So you want a repeat of that night?”
    Trish grabbed Jenna's hand and kissed it. Then she giggled and shook her head. “No, I had a different idea. Something special for my birthday.”
    Jenna smiled eagerly. This was finally a way to hook up with Trish without guilt. Or at least not as much guilt. Whatever desires Trish had, Jenna would do everything she could to make them come true. She broke the promise she had made to herself to be good, but only because it would make Trish happy. Wasn't that what a good stepdaughter should do? 
    She waited with bated breath as Trish reached out to her. She ran a hand through Jenna’s hair again, but then took a firm grip. She pressed the back of her palm against Jenna's head and yanked her hair back. Jenna whimpered, shocked by the assertive motion.
    With a hungry look Trish smiled down at Jenna. “Tonight you're going to be my pet. And I'm the owner you need to please.”
    “What?”
    “That's not what a good dog says,” Trish teased, pulling on her hair again. “You taught me how good dogs speak. Now speak, Jenna.”
    Jenna was so horny and confused and astounded by all of this. Everything was spinning so fast in her head. She wanted to be in control. She never thought of being submissive, least of all to Trish. And yet her horny brain was short circuiting as Trish stared at her expectantly. And all she could manage to do was open her mouth and let out pathetic, plaintive bark. 
    “Aw, Jenna. You can do better than that. Speak, Puppy.”
    This Time Jenna barked loudly, forcing it out of herself. Embarrassment and arousal burned in equal measure through her. But the satisfied smile Trish gave her sent goosebumps across her skin.
    “Good girl. Now I know why you like this so much. I can't wait to watch you do everything you made me do that night.”
    Jenna shuddered. Barking was one thing, but she didn't have the collar. She didn't have any subconscious conditioning making her eagerly accept and obey commands. She couldn't act like a dog and be submissive to Trish.
    Her eyes dropped to the collar around Trish's throat. That's right, Trish was her pet even if she didn't remember. All Jenna had to do was command her to let her go. To go back to being her pet.
    But when Jenna opened her mouth the words died in her throat. She promised to make it up to Trish. And this game she wanted to play meant Trish was turned on by the same kinky desires she was. If she used the conditioning to stop Trish now and take control, then she'd be manipulating her with the collar, just like she swore not to.
    It wasn't the end of the leash she planned to be on. Jenna was still scared and nervous and embarrassed and most of all horny. But she would do her best to endure it. Trish deserved that much. Maybe this was the punishment she really deserved.
    Trish smiled at her before pointing a finger to the ground. “Sit, puppy.”
    Jenna dropped to her knees clumsily. And Trish bent down at the waist with her, never letting go of Jenna's hair.
    “Good girl. Now let's have some fun.”