I was fresh out of college closeted, bi, fit, attractive, rugger living with my recently divorced dad.
So at some point my dad started dating a woman for the first time since my mom left. she was a bit crazy but pretty hot, pretty face big tits and ass, little waist. He had a good time (from what I could hear) but around Christmas the crazy started outweighing the hot and he was trying to break it off. He's not particularly confrontational so this wasn't easy for him and he was like... she's close to your age can you just like...take over? (His actual words and I'll never forget them lol). At first I was like absolutely not (he was mostly joking) but the idea did kind of turn me on a bit.
I don't know if maybe he had said something to her or Vice versa about her hooking up with me but at one point he had left early and I went to grab something from his room and she was laying naked in his bed (we all slept naked an it was pretty common for me to walk in to grab something in the morning). She was asleep on her stomach but when I grabbed what I needed off his dresser she rolled over and spread her legs so her pussy was fully exposed ready ready for me. She's definitely awake even though her eyes are still closed so i figure fuck it and I go in for a taste. As soon as I get between her legs she lifts her hips and moves in fully ready for what's about to happen.
I start slowly licking her pussy thinking she needs some time to rev up but as soon as I take her I can tell she's always stretched out. I'm absolutely certain that my dad must have fucked here before he left (which had to have been right before I woke up) and left a nice load for me to mop up. This gets me so fucking hard and now I'm eating her like her pussy is breakfast lunch and dinner. She's moaning so loud I'm pretty sure the neighbors can hear. I roll her over and start licking her ass and pussy from behind. I come up for air and start grinding my dick (which is now rock hard with my underwear pulled under my balls) into her ass and this is when I suddenly realize my dad is standing in the bedroom doorway watching.
I panic for a second but she just keeps grinding into my dick. He walks over and unzips and I reposition her so that she can give him head while I keep eating her out. I honestly try not to look yet because I don't want to get so turned on I bust immediately, but I hear him moan as she starts choking on his dick. After a few minutes he's now completely naked other than his shirt and I'm ready to fuck.