I think sometimes slow burning necessary for the story like let the author have space for story writing and building up character than get sex scene all the timee.
This story really forced to be happy ending, it's like you justify something wrong, like azuza character change that suddenly become mother maria is not it
But re-reading it, it was always like that, remember when he was crying and Karino "comforted him" I should have known they were going to soft him up since then....
This is too wild even for me