My ultimate fantasy would be Lucia riding me and using my dick to massage herself to a hands free anal orgasm, squirting her warm cum all over my stomach and chest, and the shear sight of it would excite me so much that I couldn't hold it back anymore and finally release my entire cum load deep inside her. Then she'd slowly get up so we could both watch it drip out of her ass and down the shaft of my cock.
I hope we've all been there when you're riding the cock just right and every time it hits your prostate your cock just gets painfully rigid until you blow a giant hands-free cumshot with abandon because you are so into riding that good dick.