That was my intention.

I got up over her, positioning my cock. She moved her hips up at me, helping me and begging me to enter, and then I thrust forward and I was in. I managed to enter her slowly for the first stroke, remembering that (thanks to me) she was a virgin (again). I didn't want to hurt her, then turned that thought into a command. Her hips rose to meet me eagerly and her legs wrapped around me, clenching around my waist as I slowly sunk into her, feeling only the barest resistance and drawing a long moan from her that gradually became a pleased yelp as I bottomed out. I pulled back out, still maintaining a slow, pace, her cunt gripping me hard, eager to hold me in. Then I thrust back in again, a bit faster, then out again. On the third stroke, she began to whimper, clenching her legs, and said "Harder." She wrapped, her hands around me, pulling herself up to me, pressing her breasts hard into my chest, as her hips rose up to meet mine. I needed no more urging, and I pulled out until just the tip was in, braced myself, and began to pound down as hard and fast as I could. We were not making love, we were fucking. I slammed into her harder and harder and she pulled at me, trying to get more of me into her. After a couple minutes, she came with a howl of lust. I kept thrusting into her as she spasmed under me, the vibrations finally driving me over the edge as well, and I shot my load, groaning into her, shot after shot, as she shook underneath me, almost shrieking her pleasure.

We laid there for a bit, breathing hard, my cock going soft in her. Practically no foreplay, just stick my cock in and rut like an animal... I don't think I had ever fucked like that. With my wife, it was more gentle. I definitely liked it, though I probably wouldn't want to do it all the time. It was very different from fucking more gently. I was laying on top of a gorgeous red-hot teenager who would be eager for another round in just a few seconds and for yet another soon after that, but after a fuck like that, it was going to be a while before I was ready to go again. Then I remembered how I ended up in this situation to begin with.

"Power" I said, noticing idly that she was not reacting to me apparently talking to myself, "I want to be able to have sex as often as I want. No shortage of sperm, no recovery time, no getting tired, no chapping of the cock from too much friction... no problems of any kind. For my partner too. If I want to fuck a girl ten times in a row, I should be able to do it easily." I didn't get a response, but my cock suddenly going back to rock hardness inside Lisa's pussy (drawing an appreciative moan from her; I also noticed she was no longer breathing very hard) was all I needed to know that it was now so. As an idle thought I also improved my fitness for my age (not a major change, but I no longer had a slight gut). Lisa ran a hand over my stomach, not really knowing things had changed but liking it regardless.

Based on "My Reward" by Azil