Should Have Stopped

About 10 years ago I was goofing around with a neighbor girl, Jane, in her backyard and her house, I was 16 and she was 14. This was summer so we were both wearing shorts. We were clearly attracted to each other, but only in a pretend way if that makes sense, but were teasing each other about our bodies and doing or not doing things with each other, going back and forth between I would or I wouldn't do X for various things (kissing, touching, having sex, etc.) We went inside when no else was around and in her room I said "let's pretend sex!" She asked what I meant and I was kind of making it up as I went along, but basically laid her back and started dry humping her. She again teased about liking it or not liking it, alternating to keep things from getting serious. I pressed her legs back, she was very flexible so they easily went up over her shoulders and I could see the sex back of her legs under me and feel a bit of her soft mound under my stomach when I pressed against her. Of course in reality my dick got very hard and I wanted to do more, though I knew we shouldn't. She was also egging me on more and clearly enjoying my pressing on her, though it was mostly my stomach rather than my pelvis pressing her.

She started saying things like "you're not going to give me a baby, are you?" while I said "do you want me to?" "No, don't do it to me." But she didn't really fight, she was smiling and pretending to resist. I then said "I know how to not give you a baby, we'll have fake sex!" With that I deliberately slipped my penis out of the side of my shorts, and got about a foot further up her so I could thrust it between her bare legs, about 6 inches above her pussy. I think she didn't know what I was doing at first, and kept up her funny talk for another minute. But I was getting more intense thrusting between her thighs, and then she saw what I was doing and stopped talking, getting a more serious look on her face. She stared at the head of my penis for bit, then up at me, then around her room for a few seconds, then up at me again. "This isn't sex" I told her. She said nothing and actually looked a bit more worried. I know I should have stopped, or at least asked her if this was ok, but I didn't. With each thrust I felt the head of my penis hit either the top of her shorts or her bare stomach, a few inches of which were exposed below her shirt. I kept saying "it's not really sex" and continued thrusting, fucking her thighs basically, and in a couple more minutes got close to cumming. I think then she got scared looking at my face and asked "could you stop" but I was about to cum so I just pressed into her more, and felt a wicked, sizzling, evil heat as my white jizz burst out onto her body. Some got between her thighs and lubricated my path even more so it suddenly felt ten times as good to slide between her thin legs, which I was still holding up over her head with my hands, my face just a few inches from hers as I collapsed down a bit. I then started to get scared over how she was looking at me and I started apologizing profusely, backing up from her so I could see the damage I had wrought. My hard dick was now hanging in the air but she completely ignored this and started lifting her soiled clothes. "It's ok..." she said, but quickly went to the bathroom and changed while I tucked myself back in. She soon came out and we just talked about other stuff for a few minutes, ignoring what had just happened, and then I left. We never talked about it again, and never played again, though we were friends for several more years. Looking back, I'm ashamed of what I did. I wanted to cum with a female for the first time, but it wasn't fully consensual, and I should have known better. I'm committed to always being more explicit in the future so I know the woman I'm with is agreeing with what we're doing.