My first 'real' girlfriend and I were in bed. We were both inexperienced, naive, and just discovering things with each other. After about four or five months of dating and sleeping together, she had loosened up a bit, though she was still pretty conservative. she was a brunette, a little heavy on the bottom, consummate girl next door. we were in bed after a few drinks, so her guard was down a bit. she was on her knees, head down on the pillow, her butt up in the air and she was wearing what she always wore, white, shiny fullback panties (which I loved). I was lightly rubbing up and down on her ass crack and down to her pussy, back and forth. She was getting wetter and wetter and she was breathing deeply, showing and voicing more emotion than I had ever seen/heard from her. That could have been due to the fact that she had had some drinks, and also that this was the first time I had ever done that to her. After some rubbing, her hips began to buck, like she was humping the air. It was H-O-T hot. As I pushed harder, and faster, she collapsed her legs and slammed her pelvis down on the bed and kept gyrating into the mattress and her breathing was ever heavier and she started saying, 'Oh lover, oh lover, oh lover.' Gawd it was hot watching her 18-year-old butt cranking in like that. Though only 18, her body was more like that of a 30-year-old mother, fleshy, soft, wide hips, a little cellulite. I have no doubt that nowadays she does the same thing with her husband, years later.