bl where the seme is so infatuated with the uke PLSSS like in a cute way

https://www.mangago.zone/read-manga/terano_kun_to_kumazaki_kun/

https://www.mangago.zone/read-manga/kimi_no_tabegoro/

https://www.mangago.zone/read-manga/koishite_kissshite_kanjaitai/

4 week lovers (=・ω・=)

I found this list for you: https://www.mangago.zone/home/mangalist/921591/

You could also look for lists with obsessive/possessive semes if you want them to be SO in love, but they tend to be less cute

Also, personal joker, since it might not come off as cute at least for a while: Murderer Llewellyn's Enchanting Dinner Invitation

https://www.mangago.zone/read-manga/cherry_magic_thirty_years_of_virginity_can_make_you_a_wizard/
https://www.mangago.zone/read-manga/there_s_something_wrong_with_my_popularity/