I, for one, loved Taimanin Asagi. Yes, it was hardcore; yes, it was "amoral". Whatever. It is hot as fuck, has some of the sexiest art made by Kagami, some of the sexiest voice acting, and most importantly
it has a possible good ending.
Before you throw yourself into it, I suggest you check out the games made by LILITH's spiritual predecessor, Sogna, particularly, the game called Viper RSR.