
This is the only one I know that fits your description https://www.mangago.zone/read-manga/renai_rubi_no_tadashii_furikata/
Only the 1st story though (first 3 chapters).

https://www.mangago.zone/read-manga/blue_quicksand/ seme had bad intentions but uke is just an old man so he aint acting cute. Seme already liked uke ig? but in a fucked up way. no love trope.
https://www.mangago.zone/read-manga/omega_bite/ uke never finds out tho. (omega x omega)
https://www.mangago.zone/read-manga/go_out_with_me_too/ no bad intentions but a misunderstanding. very sweet 10/10. Would have perfectly fitted your description if it wasn't a misunderstanding.
https://www.mangago.zone/read-manga/mobius_strip/ plot twist after plot twist (just read it)

https://www.mangago.zone/read-manga/neighbor_s_rice_cake_lalabomb/
Gets closer w uke over a bet with friends

https://www.mangago.zone/read-manga/my_bias_appeared/ your description matches this one
Hello I’m trying to find a good plot that consists of a seme that gets close or hooks up with the uke with bad intentions (undercover or whatever doesn’t rly matter) but the seme later on realizes that he rly likes the uke. There can be some fallout in the middle too like the uke finds out or something. I’d like it if the uke was cute, dedicated and loyal until he found out the truth…Is this asking for too much :’(