She's just grossed out (non-)

"Ohmigod, you're doing it with my brother."

Amy blushed bright red. "This isn't what it looks like."

"Really, because what it looks like is that you're under my brother's desk and you've got cum dripping from your face and your tits. What part of that did I get wrong?"

"We were... okay, it is what it looks like. I'm sick of guys ignoring me like I'm some sort of fungus or pretending to ask me out and then laughing at me when I'm all excited. Your brother was nice to me and I wanted to be nice to him back. What's so terrible about that?"

Matt had been about to interject but he kept his mouth shut. He was proud of Amy for standing up for herself. Sure surgery would be nice but the thing she needed most was confidence. Apparently a mouthful of cum had helped give her that. Perhaps he could patent the cure.

Karen shrugged. "Hey, good on both of you. As long as you're careful. And that means you, Amy. I love my brother but he isn't exactly going to stop and think about consequences, if you know what I mean."

"It was just a blowjob."

"Yeah, right. Your first blowjob. Now come on, we need to get ready for the dance."