I went out for some groceries. My step-sister was at home just chilling. Everything was quiete. Actually, it was a boring day. Didn't expect anything special, anything exciting. When I came back home, I saw my step-sister getting fucked so hard. WTF? Why wasn't I invited? I decided then so lay down next to them and rub my pussy with my rabbit dildo. What a fantastic masturbation till my huge orgasm