When I went to my girlfriend's house for the first time, she introduced me to her super cute junior high school sister! With a little ulterior motive, I sneaked a peek into her room and saw her fidgeting and masturbating by herself! When she noticed me peeking, her face turned red and she told me why she was masturbating. She confided in me that sex with her boyfriend wasn't going well. To encourage her, we decided to masturbate together, and after her first public masturbation, she came instantly, so I immediately shoved my dick into her pussy!