I surprise my girlfriend's sister sleeping and seduce her with my Asian dildo

I had a friend over and her sister was sleeping on the bed. I was feeling horny and decided to play with my Asian dildo. As I started to pleasure myself, I noticed her sister stirring. I quickly hid the toy, but she caught a glimpse of it. She seemed intrigued and asked if she could join. I was taken aback but decided to give in. We undressed each other and I began to explore her body. She moaned in pleasure as I took her to the edge, and then I plunged my hard cock into her. We fucked passionately, and as I felt my climax approaching, I pulled out and came all over her small tits. It was a wild ride and we both enjoyed every moment of it.