He was dressed in a plaid flannel shirt, tennis shoes and baggy khakis that made him look the part of the typical high school nerd. His ordinarily shy, studious face was frozen in an expression of shock. The sound Katy had heard were his school beaks dropping, as he caught his baby sister ogling his porno collection, with her fingers in her cunt.

"Oh, Jesus!" Katy gasped. "Phil!"

"What are YOU doing in here?" Phil said. He shut the door behind him and stepped towards the bed. There was a deep blush of anger and embarrassment in his face as he glanced between her and the open trunk in the closet. "What gives you the right to barge into my room?"

Katy thought quickly, and decided that her best defense was a good offense.

"Well, what gives you the right to have a dirty magazine collection?" she asked sassily. Katy zipped up her jeans as quickly as possible and rose brazenly to her feet. "Huh? How long have you had these dirty magazines, Phil, huh?"

The anger in Phil's face was quickly replaced by fear. "You have no right to come in here," he repeated helplessly. "That's my private property."

"Private property, huh?" Katy waved the magazine in front of her as she advanced toward him. "Well, what would Mom and Dad think of your private property, Phil, huh? What do you think they'd think of that, huh? So there!"

Phil looked suddenly anguished. "Please don't show them. Please."

"Well, don't give me any more stupid lectures about not coming into your room. Okay? I mean, I'm not supposed to come in here, but you're not supposed to have all these magazines, and if Daddy knew about it you'd probably get grounded for the next ten years! So don't start yelling…"

Then Katy happened to glance at the crotch of her brother's pants, and her girlishly defensive monologue ended immediately.

Her brother had a hard-on. It was difficult to tell in such baggy pants, but there was no mistaking the thick, long column sticking out of the crotch. Katy's eyes bulged as she watched the big cock pulse luridly in his pants.