I was fine with the characters and the wife sharing but the ending besides being rushed felt not only unsatisfying but made me wonder what was the point. And no epilogue for the other guy?
Rereading this a few times I'm starting to think Teru wasn't penetrated until he asked for it. Also the disappearing pocket square (?) kept tricking me. They all had it but sometimes it was drawn sometimes it wasn't.
But why, why did he cheat? It's driving me nuts!