Things change

Matt found himself staring at his sister... now nearly naked in a thong and little demicup bra that left her breasts hanging out. He tossed her torn top across the room. "Uh, that isn't how I'd anticipated this going."

Karen rolled off of Amy but left her arm wrapped around her neck... Matt wasn't sure whether it was an embrace or an ****. "How, exactly, did you anticipate this working out, brother?"

"Uh, yeah."

"So, you've got two nearly naked girls in your room with you, mom won't be home for a couple of hours, and we won't have to leave for the dance until after that." Karen stared at his crotch... just in time to see his dick, which he'd hastily stuck back in his pants when she'd arrived, pop out at full erection.

"We could study." Amy's voice sounded dubious.

"Yes," Karen agreed. "We certainly could. And I'm sure we should as well. Is that what you want to do, brother?"

He shook his head slowly. "After all, it is Friday. Which means we have all weekend to study."

"True," Karen said. "But I'm not the kind of girl who goes under a desk and lets a boy spray cum on her tits like she's a servant or something."

"Hey," Amy burst in. "That was just a fantasy, all right. We were having fun."

Karen shrugged, jiggling her tits and provoking a corresponding twitch from Matt's dick. "If it works for you, I'm happy. But I've got a better idea."