A little context before the story, this took place about a year ago and me and the older sister are no longer dating but still are decent acquaintances. So the story happened like this, we were at my girlfriends house alone watching this crime drama about a cereal rapist, now we’re both asian but she was this petite 5’6 fair girl with an amazing ass(she had a flat chest though about a couple B’s) while I was about 6 ft 165 lb and kinda muscular(went to the gym 5 times a week). She was always really prude about sex and we only ever did it twice within our second year of dating so it was kinda sparing. But for some reason the cereal rapist show turned her on and I noticed that so I took the opportune moment to kinda play with her and tease her a bit.