Anata to Dake wa Koi Shinai!

Gay bar master Kaga Soichi is triggered by a customer interaction that brings back his painful past relationships. He pretends to be calm, but Kikuchi, a regular customer who notices that he is acting strangely, sees through his agitation. He wants to calm down, so he desperately invites Kikuchi. Soichi regrets making a move on the customer and decides to leave it at that. But for some reason, he finds himself showing Kikuchi his vulnerable side, and they end up spending the night together again......

(Source: Splush Comic, translated)

Note: Includes extra chapter.