Yes. Definitely Yes

Playing it off casually, Sam answered, “Well, yes and no. Maybe not you specifically. I’ve never done it before, but I’ve always wanted to try this if I had the chance. Plus, I figured it would at least make it better for the, uh, next part..”

She huffed out a single laugh before stating, as if it were fact, “There’s nothing a virgin like you could do to make this better. But if you really think you got what it takes, knock yourself out and lube me up. Just don’t take too long trying to get me off.”

He rolled his eyes at her before adding confidently, “Oh, I think I’ll manage something. Just relax, Bree. This can be fun, if you let it be.”

She didn’t respond with more than a dismissive grunt, leading Sam to assume he could finally get back to his work. Looking down at her black underwear, he decided to leave it there for a moment, feeling his senses pull his lips to Bree’s inner thighs. He kissed and nibbled and laved her soft skin, as his hands slowly massaged her tensed muscles.

She relaxed, bit by bit, an occasional sigh escaping her before she could hold it back. It was enough for Sam to know he was getting her back in the mood, if slowly. Looking up, he saw her eyes were closed, her teeth gnawing her bottom lip as his fingers dug into the knots in her legs and calves. He watched her expression as he carefully pulled aside the black strip covering her sex, breathing hotly onto it like he savoring the scent of Bree’s encroaching lust. She smelled womanly, even a little sweet.

It was only when Sam finally, slowly, forcefully dragged his tongue in between her folds that she had to take a short breath of air. He would have missed it if he hadn’t been watching, but he DID see it. He relied heavily on the cues from the strange instincts piloting his movements, all to tease out every bit of Bree’s pleasure. It was slow, however. Achingly so. She was stubborn, willful, and trying her best not to give him any satisfaction, but she wasn’t perfect. She would still slip, his growing skill and supernatural timing was doing things to her body.

It came as a shock to both of them when Bree finally orgasmed. By that point, Sam had tasted every inch of her sex; her tight insides, her wet lips, her hot-as-sin skin, and just around her most sensitive spot. It was while his tongue was buried and curling inside Bree’s pussy, his right hand teasing her clit in circles as the other held her leg, that he felt her body clench and spurt.

She gasped and quietly moaned as her thighs twinged, a new taste flooding Sam’s tongue as one hand came down to hold his head where she needed him. She was tangy and sweet, so much that he couldn’t get enough, lapping away at her entrance until she pushed him away from her.

The two people found themselves looking at each other, neither of their eyes quite focused enough to see through the heady fog of hormones that was rushing through their bodies.

Bree recovered first, shaking her head as if waking from a dream, a frown growing on her lips as she watched Sam take heavy breaths, his tongue absently coming out to taste what remained of Bree’s glaze on his lips.

“Sam? Are you… okay there?” She asked, most of the bite gone from her tone at this point.

“Fuuuuuuck, that was…. That was the best thing… ever.” Sam gasped, drunk on his own second-hand ecstasy. Then he shook his mind back to clarity and he looked to see Bree watching him with a haughty smirk. “What?”

“No, just making sure you weren’t broken already” she teased.

“Ha ha. I feel fine, Bree. Just a little out of breath. I was down there for a while, in case you hadn’t noticed.”

“Yeah, I did. Kinda looks like you enjoyed that more than I did. I always knew you were a sub.” Her grin was cocky and her tone was mean. Same as usual again.

He frowned. “Y’know, I think for my first time ever, I didn’t do all that bad. I would really appreciate it if you let off for five minutes. Need I remind you that I did actually make you cum.”

Bree rolled her eyes. “Yeah, a little one. Not exactly mind shattering. Though, I guess I should give you props for pushing through like a trooper. You actually made it easy to imagine you were your sister, so thanks for that. Just for being such a gentlemen, I promise to not be too mean when I win our little bet. I’ll let you pick whatever color dildo you want. Aren’t I nice?”

Sam could only imagine what she was talking about, and what he came up with was… well, it was enough to wipe away a lot of the guilt he was holding onto for what he was about to do to his own sister’s bitch of a girlfriend. Maybe he would have been intimidated in another life, but he had prepared thoroughly, and he doubted Bree really understood just what she would be having to go through for the next month… maybe longer…

That last thought brought a smile to his face, a darker side of himself bubbling up and making his pants feel so much tighter than before.

“Huh. Didn’t think you’d like that, you little freak.” Bree deadpanned, interrupting Sam’s train of thought.

He sighed. “Y’know Bree, I want you to know that I am going to enjoy this next part a lot. I mean a LOT. I have tried every way I possibly can to deal with your shit. I don’t care what you say right now. I know you want to get this over with, so just turn around and get comfortable. That way you don’t have to look at my face, right?”

She stared at him, as if she was trying to decide whether to continue needling him, or just getting this over with. In the end, she shrugged and said, “Sure thing. Just make sure to tell me when you’re done, in case I can’t feel it. Last longer than five minutes and maybe I’ll let you even get a safe word tomorrow.”

Finally, Bree turned around and unhelpfully plopped herself onto the bed, prone as a dead fish. She turned her head to face away from him, which suited him just fine. He didn’t want her to care. He wanted to keep all his cards as hidden as possible, until the last possible second. His groin twitched as he imagined what sound she’d make, what face she’d show him, when he finally–

Sam took a steady breath, calming his nerves for a moment. He’d promised his sister to be… nice. Bree was pushing his buttons, but for once he had all the cards. He wasn’t a brute. At this point, Sam felt justified enough for what he was going to do, so instead of wasting any more time, he got undressed.

His shirt came off easily, as well as his socks, but taking off his jeans was an immediate relief. Looking down, Sam smiled at what was an impressively sized manhood. It was the first time he’d seen his new equipment while erect, and he almost felt bad again for Bree. He didn’t have a ruler on him, but he could tell it would have been a stretch for just about any woman.

Then again, that was one of the reasons he’d gone down on Bree beforehand, as he’d been thinking of a particularly vital rule he’d made before she’d finally joined him:

New rule: After a male twin exchanges fluids with a woman, her body becomes sexually ready and able stretch to fit the twin’s penis without pain or damage.

He wanted Bree to feel every last inch enter her, and didn’t want to waste time keeping her wet to do it. So he’d taken steps to make that happen. Taking off his last piece of clothing, Sam found himself bare and aching. Looking down at Bree, he was struck by just how amazing her body was. Again. Laying down over his sheets, a wonderfully sexy woman was giving him an amazing view of her back, her waist, and her beautiful, heart-shaped ass. Despite everything, all the things she said or did to him, Sam had to admit he understood his sister’s attraction to this woman. Better yet, he was finally going to fuck her.

He knelt over Bree, bringing his hands to her defined glutes, feeling her tense just a bit. Despite her brave facade, Sam knew quite well she didn’t want to do this. If it wasn’t for the book, this never would have happened, not in a million years. But then again, if she hadn’t treated him like her own verbal punching bag, he would have never thought to do this. So… he spread her enough to see her wonderfully wet lips between her legs. Sam angled himself till he was just before her entrance, feeling how hot his cock felt in his hands, how it pulsed hard with the beat of his own heart, how small it made Bree’s pussy look. But he knew he would fit. He was aching to do it. He wanted it more than anything else.

But…

Every muscle in his body tensed, maybe even Bree’s too in anticipation, before he managed to relax, take a deep breath, and ask softly, “Bree. I’m going to give you one chance. Just… just apologize for everything. Every time you have ever tried to make my life hell, to get between me and my sister, everything. Do that, and I’ll take it all back. I’ll make everything right again. I promise.”