Amy yaoi where the seme is ruthless and would literally kill for the uke but the uke is innocent and sweet something like https://www.mangago.me/read-manga/love_murder_basketball/
It was a yaoi and the seme had a past lover who died and that past lover was able to enter the ukes body or something and the uke could see him and would help them communicate
I'm not sure maybe this one, sounds kinda similar:
https://www.mangago.me/read-manga/sayonara_no_moment/
Childhood friends bl where seme secretly likes uke and is like possessive of him and stuff and gets jealous easily but doesn't want the uke to hate him
Here is another that has that premise. It’s waaay toxic and shifts into something else but still has what you said https://www.mangago.me/read-manga/if_you_hate_me_that_much/
Was a bl and the seme was like a super hero or something and the uke had to give him energy
https://www.mangago.me/read-manga/ordinary_daily_life_of_a_universal_guide/
This? https://www.mangago.me/read-manga/ikigami_to_donor/
Try this tag for more
https://www.mangago.me/tag/Esper%20x%20guide/