Straight dude gets dumped and ends up hooking up with someone he accidentally met on a gay bdsm app. Only to realise that they work in the same office and to have another coworker also declare his feelings and have his merry way with him.
Uke sure isn't the sharpest. Semes are ridiculously heavy handed.
3P Nonke Kaihatsu -Elite Futari ni Nerawareta Ore-