When my girlfriend went on a trip, my sister-in-law came to our house to play. She was so hot and sexy that I couldn't resist her, so I used her as a masturbation target. I was doing the dishes before dinner and she suddenly came into the kitchen and seduced me. I couldn't help myself, so I let her suck me off and even ejaculated in her mouth! During lunch, she seduced me in her nude apron and we had a purely internal cumming session. In the evening, when I was on a video call with my girlfriend, she purposely didn't pay attention to sucking my dick. In the morning, I was so excited to see her cute sleeping face that I kept on internally ejaculating on her until the very last moment before she came back from her trip! My sister and I did it for two days in a row!