There is a girl who always rides the elevator with me in my apartment. One day, while I was watching TV, she was sitting next to me and relaxing! Eh! Who is it? I was confused, but she said, "We've been together for three days already. Because there's no one at home and it's lonely. You're lonely too, aren't you?" She straddled me and was super sweet! Seeing my crotch getting hard, she started doing more and more erotic things! And I had sex with a girl I didn't know well!