Any good story about a guy being cheated by his girlfriend with a another girl.
Preferably, the guy is oblivious and the cheating is happening nearly in front of him.
I love the idea of this and taking the oblivious cuckold and angling toward female/female versus the traditional male/female. I hope there are some that get suggested as I'd love to read it.
I've got a story called 'The Unsuitable Girlfriends' where three brothers' girlfriends all cheat on them with each other, the three girlfriends having a blonde/brunette/redhead lesbian three-way.