the FL has NOT received a "yes" from the FL other than during the one night stand and is just charging ahead?? Just consider - everything in one's life, including professionally, depending on the whim of a partner? Coerced to marry??? How is that a good thing? Try, for a sec, to turn off the thirsty part of yourself, and re-consider... If you really didn't quite fancy a handsome prospective partner but they basically said, oh I have decided for our life together...
Fumichi must have depression or some other mental issue, which prevents him from taking agency in his own life that is not self-destructive. I feel like this manga is to be read from Fumichi's perspective, where he himself is only half aware of what is happening with his life. As if he has practically no energy to spare for his wellbeing, while he still retains some awareness, i.e. he wishes to gift the stroller. I would say, though, that the author overplayed how low Fumichi has fallen with the whole "trash" smell... But anyway, I would say this is not really romantic in any way, rather, might make you empathise with mental patients...
the seme sucks, totally transgressing all the limits of the uke, how could you possibly enjoy someone like that next to you? basically forcing you to have sex, basically rape, and then all of a sudden because the rapist cleans the house it is OK>? I don't think so.