Fuck, for me it was this one night at a “friend’s” house. My wife and I went over for drinks and she instantly locked onto one of there older work buddies. She was all over him flirting, touching his arm, laughing at everything he said, the whole bit.
Halfway through the night she snuck off with him to the kitchen for “another drink.” I waited a bit then quietly moved closer. I heard him growl, “You’re such a naughty little slut, aren’t you?” and my wife moaned softly and answered, “Yes… I’m your naughty slut tonight.”
They started making out like animals loud, sloppy, tongue-fucking kisses, her moaning into his mouth like a bitch in heat. I peeked around the corner and watched him roughly shove his hand up her dress, yanking her g-string aside and jamming two thick fingers deep into her dripping cunt while he grabbed her tits. She was grinding her soaked pussy on his hand like so hard and desperate, stroking his rock-hard cock through his pants and whimpering every time he would push his fingers deeper!
This went on for about 5 minutes before he started finger-fucking her faster and harder, while growling filthy ...... in her ear. My wife’s legs started shaking, her moans got louder and sluttier, and suddenly she came like a filthy whore, gushing all over his hand, while she bit her lip trying (and failing) to stay quiet. He kept pumping his fingers through her orgasm, smearing her cum all over her thighs and calling her a “his slut” the whole time. She was a dripping, trembling mess.
Meanwhile I stood there in the hallway , furiously rubbing my cock while another man made my wife cum on his fingers like a cheap whore in our “friends” kitchen.