I don't remember much, but it's a yaoi manhwa with incubus (?) MC or something like that.... The MLs are angels and the three end up in a marriage together? The angels are high rank ones meanwhile the MC is the low rank.
This one maybe?
https://www.mangago.zone/read-manga/can_angels_do_this/
I only remember very few things. the mc are the seke (or switch—to make it easier), and his childhood bestfriends are the top & bottom. they're bestfriends since kindergarten and the childhood bestfriends are in love with him since then. the bottom are the one that 'seduced' the MC first.
their sequel is about them went on a beach trip!

I read this manga a long time ago, so I don't remember much. Basically, the MC is the Class President and the ML is a playboy who's nearly failing all his class or something. The homeroom teacher asked MC if he can tutor the ML. Later, they grow close and ML even gives MC a cute cat keychain.
Is it this?
https://www.mangago.zone/read-manga/uwasa_no_saeki_wa_kare_to_koi_ga_shita/
OMG THANK YOU, yes that's the one