I started living with Yuri last winter. Today, Marin – Yuri's older sister had to go on a business trip unexpectedly. Since there was no hotel, he stayed at our house for a week. Maybe because Yuri was here, she was very attentive, always in a "defensive" state, revealing her high-waisted pants and big butt before my eyes. Especially after taking a shower, Marin carelessly walked around the empty house, so I accidentally admired her beautiful model-like body, then I had to open it and masturbate alone in the room. While masturbating, she suddenly came into my room and witnessed the whole thing. But she didn't leave, she came to take my phone and watch the sex movie I was filming. I'm so excited, I don't care anymore. I rushed forward and claimed this amazingly beautiful body! At first she resisted, but as time went on, she cried more and more