A nostalgic moment with my stepfather ended in sex

My stepfather and i were looking at photos from years ago, the typical thing you do when you're bored but i don't know how we both warmed up. he put his hand over my shoulder, he caressed me, he kissed me... and we ended up fucking. the truth is that he got a little out of hand but it was a great fuck. it sucks because it's my mother's partner, but now i can't help but want more.