I lay on the bed in my sister’s spare room staring sadly at the ceiling on a wet and windy day. This was supposed to be summer. I was supposed to be enjoying myself. Instead, all I could think about was Tom and how I had crushed his heart the previous week.

Three years ago, my Brother-In-Law Sean had popped my cherry, two years ago he’d introduced me to his brother, Tom, and we had hit it off immediately. Sure, our first night together had involved a threesome and included his brother, but a wonderful relationship blossomed from it.

Tom, just recently out of the army, had started going to...