My girlfriend and I in high school used to have fun together in her basement after her grandparents went to sleep.
I was 17 and a senior in high school. My girlfriend Dawn was about 5'2', thin, bleach blonde hair, and had a nice rack on her. I was about 5'6' then, average build, short hair and very horny.
Dawn lived around the corner from her grandparents. (I would later learn her parents had thrown her out of their house because she couldn't keep her pants on and was hooking up with all the wrong guys where they lived, so they shipped her off to the grandparents.) Most evenings I would go out for a run and undoubtedly would not make it past her house without stopping in. They had a rec room in the basement with a TV where Dawn and I would hang out on the couch while her grandparents would be upstairs watching TV. Well, I would end up staying pretty late (always got yelled at by my parents when I got home after 11 on a school night).
We would turn the TV on and make out like most horny teenagers, my hand roaming up her shirt and grabbing her tits, her hand down my pants grabbing and yanking my hard cock. There was always that anxious feeling that one of her grandparents would come down and catch us, I think grandma may have actually caught a glimpse once of something.
Well, in the end, my sweats would usually end up around my ankles (I never wore any briefs since I knew what was going to happen most nights) and her pants would usually be down too and her blouse open and bra off. I'd suck on her tits, giving her nice hickys where I didn't think anyone but me would see, and she would help bring me along nicely. I would finger her and rub her clit until I felt her shudder. For me, usually what would happen is I would rub my dick on her belly while we made out and when it was time, cum all over her belly and chest. It was great for me, but I could always tell she would hate it since she would usually get right up and go to the bathrooma to try and wipe it off and get dressed right away rather than bask in the moment. Hey, I got off, and at 17, that was what I wanted most.
Dawn and I dated most of our senior year, then she dropped me for my best friend, but I will always remember those nights together in the basement getting each other off and hoping grandma didn't come downstairs.