If you liked NTRPG and NTRPG2, I remember D.P being the same style of game (short, no CG, animated sprites in the RPGMaker style, pretty decent writing for an adult game). That same dev also has Nettle Pain and Black Fetal Movement which are supposed to be pretty much the same but I haven't played them yet
EDIT: Also props for mentioning Leane 2, probably the best NTR scenes I have experienced in a game in my personal taste (the power and age dynamics made it incredible, they had good pacing, foreshadowing... and voiceover!). A shame that it's hidden behind hours of horribly slow gameplay (and tedious writing in the non-adult scenes? if I remember correctly). Nothing some savefiles from the Internet can't remedy though. The real shame is that I don't know if we will ever see an actual Japanese dev company make a big NTR game like that again.