This is like reading the NC17 version of Otonari no Tenshi-sama, except you start at the logical conclusion (well, the degenerate doujinshi version) and work backwards at building the relationship. I wonder what kinky roleplay will get her spare keys to the home…and the eventual blessed lewd handholding leading to the inevitable engagement ring.
“on our next episode of Konbini de Deatta Eroi Onnanoko - after serving up the muff overnight, Miya bakes our boy some delicious muffins for breakfast. Intense blushing ensues for both the FMC and the MC”…