
the instant he meets the seme. wow. never seen that before

Idk..I think it’s more he felt that instant connection when their hands touched. Nanao never had to be the defensive, prickly guy with the seme because the seme treasured Nanao and put his welfare first in everything. You saw Nanao fire up at Arisake over his job, but when he understood it where the seme was coming from they both talked it out.
So, I don’t think he lost his personality. Rather he was safe enough to be his authentic self and enjoy loving his seme and being loved in return.
the seme in other manga get away with literal rape and stupid fujos go gaga over him. at least the uke here showed some spine and allowed the seme to have prolonged suffering. this was good enough for me.