Leah Tanaka looked up at the sound of footsteps, and smiled warmly as her sister’s boyfriend Steven entered the room. “Hey, man!”

“Hi, Leah,” he replied cheerfully, trotting over to the couch where she sat. “I thought you were studying?”

“Taking a break. Did I hear Amber go out?”

“Yeah, she’s gone for a run. So I guess I have some free time too! Mind if I hang out with you?”

She shrugged. “Sure, go nuts! I’m just watching some TV.” It crossed her mind that she wouldn’t have greeted any of her sister’s previous boyfriends with such enthusiasm. Amber had historically terrible taste in boyfriends - they always turned out to be losers or creeps. More than a few of them had hit on Leah, hoping she’d be up for either illicit cheating or fulfilling some kind of twin fantasy that most guys seemed to have.

But Steven was different. He and Amber had been together for almost a year now, which was a record, and in all that time he’d never been anything but friendly and pleasant. Leah really liked talking to him - he was a good conversationalist and always made time for her, never making her feel like he was impatient to go and hang out with Amber instead. Early on Steven’s kindness had made Leah suspect that maybe he had feelings for her, but he had denied it outright, insisting that he loved Amber and simply wanted to be close with her family. He had even given Leah a piece of jewellery as a token of his goodwill - a pendant with a gorgeous amethyst gemstone. Any notion that this might be his way to seduce her was dispelled when she learned he had several of these, which he gave to all the important women in his life. He’d given one to Amber as well, and to the twins’ mother.

Steven walked past Leah to the empty space on the couch to her left, but did not sit down. “What’s on?” he asked, gesturing to the television. He then leaned forwards and took hold of her by the armpits, lifting her out of her seat.

“Miranda Calderon’s chat show,” she replied, automatically moving in tandem with him as he stood her up. He then grasped her hand, put his other hand on her back, and pushed gently, causing her to take a few steps forward as he led her by the hand. “The leads from that new Marvel film Eternals are on today.”

“Oh, Richard Madden?” Steven asked, as he took hold of Leah’s pants and tugged them down to her ankles. “And who’s the woman, I can never remember her name...” He took her panties down next.

“Gemma Chan,” Leah replied. Placing his hands on her shoulders, he pushed her down, and she dropped to her knees. Then he took hold of her waist and lowered her forwards, and she instinctively put out her arms, so that she ended up on all fours. She raised her head so she could still see the TV screen clearly.

“She was in another Marvel film, wasn’t she?” Steven asked, as he took his own pants down, exposing his erect cock.

“Yeah, Captain Marvel,” Leah nodded. “Not the same character though. Normally that kind of thing annoys me, and Captain Marvel wasn’t long ago, but frankly, I’m too happy about seeing more Asian superheroes. I feel so seen.”

As she spoke, Steven eased his dick into her back passage. She gasped instinctively, her fists clenching against the carpet, and her pussy growing slick and juicy. But her conscious mind took no notice - she didn’t even register the mid-word gasp that turned the word ‘Marvel’ into ‘Ma-ahhh-vel’, or her increasingly rapid breathing over the rest of her sentence as he slid himself slowly back and forth inside her. Nor did she think to glance down at her pendant as it dangled from her neck, almost reaching the carpet. The purple gem seemed to be shining brighter than usual - almost glowing.

“Well, it’s a good year for Asian heroes, isn’t it?” he noted, as he slowly bumped his pelvis up against her pert ass cheeks. “What with Gemma Chan, and Simu Liu only a couple o’ months ago...”

“Mmmm,” Leah sighed, her body trembling with pleasure. “W-we’re getting better rep... representation all the ti-ime. Can only be a good thing...”

As Lunch with Miranda started, conversation between Leah and Steven came to a natural close. Her attention was on the chat show; his was on continuing to fuck her from behind with increasing vigour. As he sped up, their respective grunts of arousal grew more and more pronounced. Finally, as the commercial break began, he came inside her. Withdrawing, he leaned down and grabbed Leah’s discarded panties from the floor, using them to wipe his cock clean.

For her part, despite being oblivious to the sex taking place between her and her sister’s boyfriend, Leah had come close to orgasm, sweat glistening on her forehead. Following Steven’s withdrawal, her arousal began to die down again, denying her body the satisfaction she wasn’t even aware it craved. He took her by the waist, pulling her up to her feet, and then moved her backwards a few paces and plonked her down on the couch. She wore a pleasant, guileless smile as her body complied unresistingly.

Steven smiled with satisfaction at his girlfriend’s twin as she sat and watched the commercials, still naked from the waist down. He reached down between her legs and teased her dripping wet entrance with his fingers for a few seconds. “So, how are your classes going, by the way?” he asked casually, as if nothing untoward had occurred. Of course, he knew he could’ve grunted the question mid-orgasm and she would have responded as if he’d spoken normally. That was the nature of the enchantment, after all.

“Oh, yeah, it’s going pretty great,” Leah said brightly. “I did pick business as my major in the end, like I told you a few weeks ago.”

“Ah, nice.” He kneeled on the couch beside her, raising his pelvis so it was level with her face. “What are you studying for that right now? I know you tried to explain it to me the other day, but I didn’t really understand!”

She laughed. “Don’t worry, it’s pretty complex stuff - I struggled to get my head round it at first, too. So, basically...”

He interrupted her by reaching out and prising her jaw open, holding it agape with his left hand. With his right hand, he seized hold of the jet-black hair that flowed down the back of her head. Then he stuck his cock in her mouth.

Leah kept talking as if nothing had happened. She began explaining, in detail and as plainly and clearly as she could, exactly what the current topic of her business course entailed. It was a pretty good explanation, but Steven heard none of it, because every word was muffled by his thick, pulsating shaft as he thrust it back and forth. Regardless, Leah carried on, her lips wriggling and undulating around his shaft as they tried and failed to articulate her words.

In the midst of this, Amber returned home. Wandering through to the kitchen, she put her empty water bottle on the counter and instead filled up a glass from the sink, taking a big swig. She then strolled through to the living room, where the sight of her boyfriend fucking her twin sister’s face greeted her.

“Oh hey, you guys,” she said breathlessly, still worn out from her run.

Without even slowing down, Steven looked over at her and smiled. “Hey, babe.”

“Hi, sis!” Leah said. Or at least she thought she did, not realising her greeting was completely unintelligible.

Amber grinned at her, seeming to understand what she had said regardless. As she padded across the soft white carpet towards the sofa, Steven watched her own amethyst, glimmering with magical light, swing back and forth in front of her sports-bra-clad chest. She approached her boyfriend and gave him a quick, tender kiss on the lips.

“How was your run?” he asked.

“Good! I shaved about a minute off my time.” She beamed proudly. “Seriously considering signing up for that marathon next spring.”

“Hey, you should,” he grunted, speeding up the movement of his cock inside Leah’s mouth, gripping her hair tighter as he forced her head towards him. “You’d be great...”

She smiled lovingly at him, and then glanced at Leah. “You two having fun together?”

Her twin replied with a muffled “Yeah!”

“Cool. I really am glad you guys are so close!” She kissed Steven again, this time just a quick peck on the cheek, and then trotted away. “I’m gonna go take a shower.” Glancing back, she gave her boyfriend her sauciest wink. “Feel free to join me...”

He chuckled. “I’m right behind you!”

As Amber left the room, Steven moaned with ecstasy and came in Leah’s mouth. She obligingly (and obliviously) swallowed most of it, though some trickled out of her mouth and down her chin. “So, did that explanation make sense to you this time?” she asked.

“Uh... nope, not a word,” he laughed. “I guess I’m just not cut out for business.” Picking up her pants from the floor, he wiped her face clean with one of the legs.

“Well, don’t you worry about it. You just stand there and look pretty, and let me handle the clever stuff,” Leah said with a grin, as Steven shifted her butt off the couch and lay her back.

“Ha, ha, funny!” He pulled her cum-drenched panties and pants back up her legs and into place. With that done, he repositioned her so that she was sitting upright again. He glanced at the TV. “OK, I’m gonna leave you to your superheroes and go join Amber.”

“Don’t keep her waiting!” Leah joked.

Her eyes followed him as he strode out of the room.

Damn, she thought to herself. Why’d it take Amber so long to find such a nice guy?