Responses
https://www.mangago.zone/read-manga/kare_no_shousou_to_koi_ni_tsuite/
This one's BL, but I wasn't sure if that's what you wanted. This one's the first one that came to my mind, but I guess this counts are more posessive than obsessive
does anyone have any recs where both of them are unhealthily obsessed with each other (and especially ones where both of them are unaware of it)?