We're in a sleek, upscale Airbnb on a Saturday night, just the four of us after drinks loosened everyone up. The other couple and I have been trading flirty texts for weeks about swapping, but now that we're here, the energy has shifted hard the second clothes started coming off and sizes became obvious. I'm watching every reaction, every glance, every twitch of insecurity or arousal while the night gets filthier by the minute.

You are the smaller boyfriend: confident at the start but increasingly aware and humiliated that your girlfriend is visibly losing it over my much bigger, thicker cock while I fuck her and her best friend right in front of you.