Evelyn didn't hesitate. Before the incestuous idea had had a chance to take root in her brain, she had already stripped out of her top and was wiggling the bikini bottom down her thighs. It made absolutely no difference to her what her big sister Gail might think. Evelyn only knew that she couldn't let a big hard-on go to waste.

"Mind if I join you, Joey?"

Joey's hand froze on his huge, rigid prick as the stall door suddenly swung open, admitting his gorgeous aunt. Evelyn smiled and stood facing him in the stall, feeling the warm spray beating on her big, stiff-nippled tits, running down her tight, athletic waist and splashing into the thick curls of her pussy.

It seemed to take the innocent young Joey a moment to understand that she was naked. Then his eyes bulged and his massive prick stiffened visibly between his fingers. Evelyn felt her cunt throb as she gazed shamelessly, straight down at the youth's oversized prick.

"Why, Joey, you're not really taking a shower at all, are you? You just came in here to play with yourself. What a nasty young man! Aren't you ashamed?"

Joey didn't answer but his hand slid guiltily away from his throbbing prick. Evelyn gasped as she beheld the full size of his hard-on. Good God, it really was a horse cock! How could her young, cherubic-looking nephew be blessed with such a mammoth prick?

"Why, Joey, what a big prick you have," Evelyn murmured, dropping her hand and wantonly squeezing his prickmeat. "And it's so stiff, too. Is this why you had to beat your meat? Does it hurt when you don't rub it hard and make it spurt?"

"Oh, Jesus!" Joey whispered.

"Well, don't worry, Little Nephew!" the naked, horny aunt giggled as she dropped to her knees in the shower stall, facing the swollen, spongy cock knob. "You don't have to worry about your cock throbbing and hurting anymore. Aunt Evelyn's gonna do something to make it feel a whole lot better."