these are technically it, but they vary in shades of dark and twisted.
https://www.mangago.me/read-manga/obey_me/
https://www.mangago.me/read-manga/warehouse/ (not really stockholm syndrome, but they did love each other)
https://www.mangago.me/read-manga/sadistic_beauty_bl_sidestory/ (it's moreso a resignation than stockholm syndrome)
https://www.mangago.me/read-manga/color_recipe/ (seme is freaking yandere, but no stockholm syndrome)
https://www.mangago.me/read-manga/sheep_s_mask/ (kidnapping + rape + no stockhom syndrome + horror)
thank you for the suggestions! but i have read them all ╥﹏╥
welp. those were the only ones I know :/
anybody knows yaoi with seme obsessively kidnapping/ stalking uke but the uke doesnt end up with stockholm syndrome?