Created a throwaway for this. True story and it just happened a few months ago. I have a half sister who was getting married out of state. A few days before the wedding i break up with my gf and go to the wedding alone.
I have my own room and my half sisters half sister (they have the same dad different moms, while me and my half sister have the same mom but different dads) is also coming. When i get there my half sister asks if her half sister can stay in my room because of some sort of booking issue. So im like sure whatever.
Im not gonna lie, shes gorgeous. Tiny, nice body. Shes also like 8 years younger than me (shes early 20s) but obviously the cultural thing is there where its like super weird to even think that shit. But who doesnt like a little naughty shit? So i kick her out of the room so i can get ready for the evening festivities. Of course i decide to rub one out, and sitting there choosing porn i was seeing all the step sister shit so im thinking damn im in this same scenario. I do something ive never done and grab her underwear and jack off smelling it and stuff, wow that was so fucking hot to do for the first time and it was my step step sister.