I once dated a girl I'll call "A" who was a couple years older than I was. The relationship was based purely on lust and sex - we never went anywhere really, except to have a private place to make out, and the rest of our interactions consisted of phone sex. "A" came over to my apartment one day and I locked my sister out of our shared/divided room. We started fooling around like usual...

At one point, she got on top of me - this was new. We started dry humping,...