I'm so ashamed of myself and I'm struggling whether I should confess to my mother about what I've done with my step father. My mother was out with friends, my step father came in after he'd been out with his friends playing pool and had been drinking. I found him lay on the sofa wearing his loose shorts and they weren't fitting him properly. In other words his cock was showing. Feeling very horny I took his cock and began to play with it, then bending over I took it into my mouth and sucked on it until it became hard. My pussy was acheing to be fucked after I'd been touching myself, so I lowered my night pants and panties, backed up to where he lay and skipped his cock into my pussy. I fucked my step father until I came on his cock, with him only murmering slightly about it feeling nice. Seeing his engorged dick still throbbing, I turned around and rubbed and rubbed his cock head all over my pussy slit until he came all over me and the sofa. Fearing he might wake up I left him that way and heard my mom shouting at him saying he was stupid idiot, masturbating and leaving his cock hanging out so I could have seen it. They both don't know it was me, but they've not spoken civily since and have argued about it constantly. I don't know if I should own up or keep quiet, because secretly I'd love to feel him inside me again.