The shower curtain was drawn open

Oh no! You barely noticed it, but the shower curtain was swept open. The moans must have lured your father inside!

You felt something poking at your large butt and two hands grab your breasts from behind and massage them gently. "You only lasted ten minutes without me" came your father's voice from behind. It instantly removed the erotic trance you were in as you turned around to face him. "H-honey this isn't what it l-looks like" you said, nervously. "You sure? Because to me it looks like my wife needs a hand" he grinned. Shit, what were you going to do? Surely you couldn't have sex with your father... right? The idea wasn't that disturbing since you never got off and were still really horny. Then you got an idea; what if you gave him a handjob. If he comes he can't go any further!

"Let me take care of you" you cooed, trying to be seductive so you could get dad to come and that'd be it. You weren't ready for anything else yet. He didn't say a word and so you went to work. You grabbed the cock, which was now at full mast, and started rubbing it up and down. "What would it feel like to have that inside of me?" came a thought. You increased the tempo until you were jerking him off, but you couldn't keep your eyes from it. Something about the cock intrigued you and you couldn't quite figure out why. Dad moaned as the jerking intensified and he was nearing climax.