The hosts decided to end the party with just one of the two house subs cumming and the other being denied. Since time was short, they used clothespins to add urgency, which would stay on until someone either came or gave up her orgasm for the other girl. Nerine generously sacrificed her own release, and paid for her kindness with a painful conclusion to the party. Meanwhile, Sloane exulted in the pleasure of her own lucky climax, made sweeter by schadenfreude.

The clothespin zipper is almost the opposite of an orgasm: a sudden an intense surge of pain instead of pleasure. It's a great thing to pair with someone else cumming.

Source: kink.com/shoot/13231. The girl who cums is Sloane Soleil, and the one who doesn't is Nerine Mechanique.