S** with my Girlfriend's sister
So my Girlfriend was working the night and wasn't coming home til 11:00PM. So I had the time to myself. Her sister came over to use our shower since her's broke down. Me and my girlfriend are 22. Her sister is 21. It was 8:00 PM When she came. She was done taking a shower when she called me. She was naked and masturabating herself. She asked If I could help her masturabte. I didn't want to betray my girlfriend but she was just so hot. So I fingered her that night and she was moaning. I liked her p**** too. After that, she got clothes and my girlfriend came home. Her sister ended up staying the week at our house. And I fingered her every time. And one day she opened my flap and sucked my c***. It happened recently. My girlfriend still doesn't know. I love her but her sister's just too hot. How do I stop? It's to tempting.