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Shin Sei Den RJ171742
She ill server RJ208892
Tobihime RJ264935
Succubus Affection RJ277631
SUMMER - Countryside Sex Life RJ283590
Lutellaria (RJ01042384) and Setalia
NTR Legend RJ295125 (it's netori and the game has 4 lines of dialogue total so you can play even if NTR isn't your thing)
Castle of Temptation RJ382297
Noelle Does Her Best! RJ324709
Anything by Sprite Hills (RG25799), the first Akanemachi game is the weakest one but the others are great
Some other dieselmine stuff like RJ253916 and RJ376981 if you don't mind futa
monotool(RG23155) games
You can also try TissuBox (RG34541) 'games' but there is not a lot of gameplay there

As for background characters having sprite sex I remember BelialRed having a lot of that but that game is really dogshit