I remember one but I forgot what it was called! The uke was captured by the seme but the only reason why the uke decided to stay with him was because the seme couldn't take care of himself!
http://www.mangago.me/read-manga/soine_lovers/ 3rd story? But idk if this counts since the seme treated the uke pretty bad for the first part
Yamato from Rogue is quite possibly the healthiest seme depicted in yaoi I have seen as of yet.
http://www.mangago.me/read-manga/rouge_katsura_komachi/
Any mangas where the seme takes good care of their uke?
(Prepping properly,Good mental health check , not forcing them etc)