IENE-851 When I opened the toilet at home, my big-breasted sister was pissing in a weird outfit.

I, a virgin, discovered my sister peeing in the toilet in a strange pose and was deeply intrigued by seeing a woman’s body for the first time. I threatened to tell her boyfriend about her doing something weird, then carefully observed her vagina, getting excited in the process. She started touching my dick! I ended up losing my virginity to my aroused sister! I even came inside her!!