Responses
Red mansion, but they're both crazy
https://www.mangago.zone/read-manga/sonna_ni_iu_nara_daiteyaru/ (uke loverboy, not rlly red flag tho. i rlly liked this)
https://www.mangago.zone/read-manga/sweet_heart_trigger/ (this one might be more what ur looking for, uke is kind of obsessed w seme and does alot of...questionable things. red flag for sure)
Any BLs whhre the uke is obssessed / extremely in love and he is also very cute? Kind of a red flag uke
Ive read one like that but i cant remember the name ugh