How can I resist using her one last time?

But after a while of terrifying her with this prospect I couldn't resist a last encounter with the pussy that had been my own for so long, so I pulled out of her ass and thrust into her cunt, taking her by surprise and making her cry out. She'd always been super tight, which made sex painful for her but didn't stop her wanting it, and made me enjoy it even more. I would definitely miss that about her - my new girl wasn't quite as tight, though definitely not loose, and she made up for it with the improvement of the rest of the body.

We fucked raw and wild for ages, me ramming her mercilessly in doggystyle and missionary, then when I wanted a rest making her ride me in cowgirl, getting her to squeeze her vaginal muscles and work me right, showing me the final product of her skills which I had honed in her to my own tastes. I pushed her back onto her back to finally cum inside her, a huge powerful orgasm into the depths of my ****.

I pulled out, and the significance of that moment wasn't lost on her, as she knew in that one second she had been entered for the last ever time, and her look went from one of sexual bliss to panicky sadness.