I started living with Yuri around last winter. Today, Yuri's sister Marin had to go on a sudden business trip. Since he couldn't find a hotel, he stayed with us for a week. Maybe because Yuri was here, she was very attentive, always on the defensive, she showed off her beautiful pants and big ass to me. Especially after taking a shower, Marina walked around the house naked and comfortably, so I happened to admire her beautiful model-like body. I couldn't stand it anymore, so the next morning I had to turn on the sex movie and masturbate alone in my room. While masturbating, she suddenly came into my room and witnessed everything. But she didn't leave, she came to take my phone and watched the sex movie I was playing. I was so hot, I didn't care anymore. I ran forward and took this beautiful body.