My mom and I have known each other for a while, although I still rarely kiss her, and sex is also rare. Today Mami's parents went on a business trip so my friend invited me to spend the night there. Very good! The first time I spent the night at my lover's house, just thinking about the two of us sleeping in the same bed and comfortably "abc xyz" was very satisfying. But suddenly Mami said that she had an older sister named Yum, I was a bit surprised because I always thought she was an only child. When I arrived at Mami's house, Yume-san immediately came to talk to me. Yum is a very cheerful, friendly person and likes to ask 'sensational' questions. I didn't care until she showed off her ass in front of me even though Mami was next to me! I was quite confused but I couldn't take my eyes off her perfect body. And while I was in the room talking to Mami, Yume-nuna immediately made an excuse to take my girlfriend out, and she continued to use her body to seduce me. Unable to resist her beauty, I put on a condom and officially fucked my girlfriend's sister in her room! But while making love, Yume-san stopped and took out the condom. I know it's dangerous, but the joy of being naked makes me think of anything. I fucked her like crazy and kept cumming my cum into her pussy! And during two days and one night at my girlfriend's house, I “ejaculated” into her womb countless times while my girlfriend was right next to me…