"Oh, fuck!" Kathy gasped. "D-d-don't tell my parents! Just don't tell my parents!"

"But I don't even know your parents…" Karen began.

But the girl was obviously too frightened to listen. The terrified blonde swiftly started struggling into her clothes, nearly falling over in her haste to wiggle into her tube top and tight faded jeans. Karen tried to think of something else to say to her, but it was obviously too late. A minute later the girl was gone, slamming the door behind her. Karen heard the frightened footsteps scampering down the hall.

Which left her all alone with her naked kid brother.

"All right, Jimmy! For God's sake!" Karen stood in front of him with her hands on her hips, her cheeks red, trying not to ogle his giant boner as she looked at him as sternly as possible. "Would you mind telling me the meaning of this right now! Please!"

"The meaning of what?" Jimmy grinned. "Shit, I didn't do anything wrong. We were just fucking that's all."

"Jimmy, you're… you're just a baby!" Even tough he was eighteen, Karen still sometimes thought of him as a child. "And that girl…"

"She's eighteen too, Sis."

"I don't care! You… you were fucking her right on the couch like that! What if I'd had a friend with me? It would have been the most embarrassing…"

"Well, where else was I supposed to screw her?" Jimmy said, still grinning. He obviously didn't take his sister too seriously. "In your bedroom? That would've really gone over big with you, huh? I mean, seriously, you're the one who ought to apologize!"

"What for?"

"For busting in on us without letting me cum first!" Jimmy shot back. "Shit, I was just about to dump a big load into her! Now I'll probably get blue balls!"

Jimmy grimaced and slumped lower on the couch. He gripped his enormous prick and jacked it several times, making the fat knob puff up and emit milky droplets of pre-cum. Then he just lay there with his giant fuck organ throbbing over his belly, the most suckable looking cock that Karen had ever seen.