My wife (girlfriend at the time) were celebrating our friendship anniversary. We were several years into the relationship at that point and had a healthy sex life. We’d fuck or masturbate each other whenever we’d meet.
After dinner and some drinking that night, we talked about how we’d make our sex even better. She started talking about her deepest desires like getting fucked while on sleeping pills. Feeling pressure to say something just as daring, and being a little tipsy, I admitted something I never thought I’d say.
I told her I masturbated to her younger sister. For context, the sister looks just like my wife, except she’s slightly taller and has smaller tits. Her ass and thighs are just as juicy though. She also has a contrasting personality. My wife is introverted and gullible while her sister is loud and in your face.
My wife was initially shocked but soon after admitted herself that she figured I’d find her sister hot. She began asking what exactly I think of when I jack off to her sister. I said I thought of fucking her while my wife would watch, and having a threesome with them.