So, my dad and mom split when I was 2 years old since they were only 18 and 17 at the time she got pregnant. I only recently got back back in touch with my dad being 18 myself. He has a fiancé and let my stay at his house while I work to save money. He lives in a very nice condo with his fiancé, me, and his fiancé’s little sister Emma (26). Ever since I started living with Emma I thought she was super hot. She is 5,9 from Denmark with black straight hair and a huge ass. It’s been two weeks since I started living here and yesterday I had a day off. So I went to the living room to watch something Emma was there so we decided to watch wolf on wall street. So we laid on the couch. Her feet on either side of me near my shoulders since she’s 2 inches taller than me and laying down and my feet in between her legs with my back against the couch sitting up. We got the the scene where Margot Robbie and Leonardo dicaprio fuck(my favorite scene). I get horny and get an obvious boner. She saw and I saw her look away and bit her lip. That got me horny that and seeing her legs spread with my feet right near her pussy. So I decide to put my foot on her pussy. I did and she instantly moaned and flinched. But didn’t say anything and my dads fiancé came out her room so I kinda moved my foot back down not all the way but mostly. By the end of the movie I saw a small wet patch at her crotch. We went back to our rooms. I heard something coming from her room and walked inside. She was fingering herself fully exposed near the door her pussy wet glistening clean shaven. I instantly got hard and she saw. She motioned for me to come over to her and the undid my pants. She didn’t need to excite me anymore and we were both horny so she pulled me on the bed and got to riding me. Her pussy felt amazing so tight and wet and her huge ass bouncing up and down. I couldn’t last any longer and came 2 huge loads right into her pussy right after I felt her walls tense up around my cock and she came almost in unison. We have not talked about it since.