When I'm almost ready to cum, I tell her, and she just says "Yes! Do it!"

A couple more bounces, and that's it – I grab her hips and hold her steady as I push my cock as far inside her as I can before I feel the first wad of my cum try to coat her tonsils. She must feel it, too, because all of a sudden, she gets even tighter around me as she literally screams with the start of an orgasm.

I can feel her pussy clenching around my cock like one of those finger trap toys – except that her trap isn't wrapped around my finger, and it's a whole lot hotter and wetter.

I finish pumping what felt like gallons of cum into her, but she isn't done with her orgasm yet: under my hands, I can feel her body still going through occasional spasms as her vagina continues squeezing me. Normally, something like that would work to help keep me hard; but she's so tight inside that she's actually forcing the blood out of my dick, making me soften and shrink even faster. If she hadn't told me we had all night, I'd have felt pretty disappointed. On the other hand, I got that much more time to suck on her boobs (and make her climax last longer), so it worked out okay.

When a minute or so went by that she didn't have some kind of orgasmic aftershock, she opened her eyes and absently said "Damn, that was good!" Then she seemed to suddenly realize that I was there, and she kind of blushed a little before she told me "Thank you. That was really nice!"

I gave her a grin and answered "I thought so, too", making her smile at me.

A few seconds later, she got off of me, and I realized just HOW tight she was when she didn't have to do anything to keep my cum from running out of her. Even if she was clamping down on purpose, it still impressed the hell out of me.

She took a step back from the chair I was on and gestured that I should stand up. I did, and she reached out to unbutton, and then remove, my shirt before setting it over where she'd put my pants. That left me as naked as she was, though not as nice looking.