I didn't know what thread to post this in but I'm sure we'll survive. I want to get this out while the details are still fresh.
He isn't my real dad but I am really attracted to my step-father.
I woke up earlier than usually and decided I'd drive down to my mom's for a visit. When I got there, no one was there but him. I'm familiar with his morning routine enough to know that he'd soon be getting naked in the bathroom and possible rubbing one out. There's a crack between the door and the seal that's wide enough to see into the bathroom. If he stands close enough to the sink and he is naked, I'll usually get some cock action.
So he finally goes into the bathroom and I quickly trail as I hear the door close. I look into the crack and he's already got his pants down off and is in front of the sink. His crotch was pretty much in full view while he was brushing his teeth. After he finished, he stood there for a couple seconds and then he started touch his cock. He rubbed up and down with the palm of his hand and then pulled his foreskin back and forth. I knew he was about to jerk off but then he pulled away and I heard the shower go on. I knew he was going to jerk off and I thought my fun was over or I'd at least have to wait until he got out to dry off to catch anymore glimpses of him.
I went between reading the newspaper and standing by the door listening to what was going on. I could hear him moaning with pleasure and it made me even more excited. He's moans seemed to get louder and louder so I figured he was about to cum but it went on for a few minutes. I stood next to the door and then I heard a couple of phrases come out of his mouth I never thought I'd hear coming from this masculine, straight man's, man..."Yeah, get it in that fucking asshole. Yeah, deeper. Mmmm...Yeah, right in that butthole." Soon after, he moaned louder than ever (probably cumming) sprayed around and turned the shower off.
Not a really hot story but just hearing him utter what I though I'd never hear in my life really turned me on. It is only one experience but it kind of made me second guess his sexuality. It doesn't really matter either way as it'll be a hot memory.