What if Tev and Feiyn did the thing later on after a few years together. The marriage thing. D’you it’d work out pretty well? Although I figure Tev wouldn’t really care.

I think so, Tev is slowly remembering what it is like to have positive emotions. He probably won’t ever feel them as easily as he did when he was still alive, but I think eventually he’d get to a point where he’d be able to express the feelings he has for Feiyn.