hold up what part is refreshing?
Uke is already gay, compared to "but he's a guy" or "i'm not gay, but i only like you". Thought it was going to be another blackmail angsty drama, Uke has no problem with sex. The drama here is because they agreed to be Sex Friends but wanted to be official. They at least communicated.
Too bad it's just a bit lackluster.
If you're talking about the "uke being gay and embracing his sexuality" trope then there are a ton of mangas with the same setup with maybe more interesting storytelling. It's really nothing new. Korean yaoi didn't do it first or anything. It's always been around as far as i can tell.
Just a few examples:
http://www.mangago.zone/read-manga/koi_da_ai_da_wa_sateoite/
http://www.mangago.zone/read-manga/antique_bakery/
http://www.mangago.zone/read-manga/therapy_game/
http://www.mangago.zone/read-manga/namae_mo_shiranai_machiawase/
http://www.mangago.zone/read-manga/hebikui_tori/
http://www.mangago.zone/read-manga/kekkon_suru_kamoshirenai_otoko/
http://www.mangago.zone/read-manga/yoru_wa_tomodachi/
http://www.mangago.zone/read-manga/keeping_his_whims_in_check/
http://www.mangago.zone/read-manga/sweet_beast_suji/
This is actually refreshing for a JPN Yaoi. Which is kinda sad since others have already been doing it. Like Korean Yaoi for example.