What yaoi is this?

okay so there is basically no detail at all i completely forgot everything about this manga except for one scene (its fine if no one will be able to give me an answer QwQ but hey i can at least try) basically i think it was the last chapter and it was like an extra and the seme had to go abroad (he still hasnt done it with his lover yet) but he asked help from his roommate to think of fap material and then when he helped he immediately went to the bathroom and thanked his roommate i think it was him imagining his uke being wet in the shower?? anyway thats all i remember i hope it gave you enough QwQ if not i already accepted my fate