Hell yes!

Okay, Matt knew this was gross. Karen was his twin sister. She was not girlfriend material. On the other hand, she had a smoking body and he had a hardon that Cindi's blowjob had, if anything, inflamed rather than quenched.

"The deal is, neither of us ever tell anyone. Not our best friends, not our parents, nobody. Forever. Do you agree?"

Karen squirmed over his lap, sat up and kissed him on the lips. "You're the best brother. This is going to be so fun."

She stood and started stripping while Matt watched. He'd known she had a great body... slender but with a nice set of tits and a really toned ass... but he'd never imagined she'd put it on display for him like this. She stepped close to him as he still sat on the bed bringing her pussy close to his face. "I did the landing strip thing," she said, pointing out a feature Matt was having trouble dragging his attention from. "I thought that a complete shave would make me look like a child and the full bush might make me look like I didn't expect to be getting any. What do you think?"

What Matt thought was it was beautiful. He struggled for words.

"No touching," she said when he reached for her. "Well, maybe afterwards but I want to learn the blowjob thing first."

"Yeah, okay."

It was fortunate he'd had a blowjob an hour earlier because now Matt had at least some idea of what was supposed to be happening... more than he'd gotten just watching videos of professional actresses pretending to like having their throats reamed.

He told her about protecting his dick from her teeth the way Cindi had, and grabbed the back of her long hair to navigate her in.

She took his dick into her mouth gingerly, as if afraid she'd break it... or that it would break her. Then, slowly, with him guiding by shoving on her neck or pulling on her hair, she started sucking him.

His phone sat on the bed, still opened to that selfie of Cindi and he felt a momentary surge of guilt accompanied by a greater feeling of satisfaction and a really naughty idea. What if he just reached over and grabbed his phone. How cool would it be to have a POV shot of his sister sucking his dick?