ive been vibe coding a ntr game with the phone mechanic and slowly learning unity. thought it was going to be hard but its pretty straightforward just asking chatgpt how to do things. good flexibility with tacking on features and what not. i recommend it.
but then again i am planning on my game not being entirely vn and it has a combat gameplay side. renpy would be best for strictly text based game like the ntr phone games out there.
also selling the baseline program wouldnt work. for porn game makers, especially in the west, almost all money comes from donation platforms because its common practice to just pirate everything porn/hentai related. they will post your shit on f95 regardless if you try to license it or not. patreon is really all devs have.