Some are not really obsessed per say but rather just protective/observant, hope you still enjoy!
https://www.mangago.zone/read-manga/ojou_sama_ga_mamorasete_kurenai/
https://www.mangago.zone/read-manga/ojiichan_shinanai/
https://www.mangago.zone/read-manga/the_handsome_husband_loves_his_gorilla_wife_and_pretty_daughter_too_much/
https://www.mangago.zone/read-manga/sukinako_ga_megane_wo_wasureta/
https://www.mangago.zone/read-manga/osananajimi_ga_mamasugite_tsurai/
https://www.mangago.zone/read-manga/paperbag_kun_is_in_love/
https://www.mangago.zone/read-manga/chotto_kiken_na_amaama_onii_san/ (oneshot prequel to https://www.mangago.zone/read-manga/assassin_cinderella/ but I personally don’t recommend the actual series because it feels like they dumbed the girl down, she doesn’t act like the way she was supposed to be, but you can give it a go if you’d like!)
Anyone have some fluff romance not too smutty (if it does have some) with obsessed ml..? Literally could be bl, straight IDC I FEEL LIKE I READ EVERYTHING