Hard to pick just one, but… Seeing her mouth watering while she’s sucking my cock. Fucking a total stranger that I met a few minutes ago. When she digs her nails into my thigh while I’m fucking her from behind. Possibly the top of the list- When the girl I’m fucking from behind grabs my cock and puts it in her ass without saying a word.
I have a couple of times but it’s more about blind luck and being in the right place than anything. I met one at a gas station in the middle of the night. We flirted a bit, she lived a mile up the road and within minutes I was balls deep in her. It helped that we were both on our way home from some bar and didn’t hook up. After blowing me and finishing me off, she swallowed, looked up and said “I’m Beth by the way”. She was a great FWB for a couple of years. Blind luck.
I love the feeling when you know a stranger is watching you get undressed or get out of the shower. You know his heat is racing,he is mildly shaking with anticipation of touching you ,and you of him. Then you feel a hand gloss across your backside him realizing your pantyless. And you guide him over to a park table with mild chit chat that you know he will be in you soon . Without even sharing a name his hand is on your baldbever and your soaking wet .