Made this list for another post. I like those three games you mentioned and here is a list of other titles (specifically Unreal Engine only) that I have enjoyed:
HyperDeep
Carnal Instinct
Cost of Survival
Blue is Better 2 (everything by Auril, actually)
Silicon Lust (also by Auril, really good game)
Monolith Bay
Rise of Asmodeus
My Lust Wish
Harem Maker
Seed of the Dead 2
Threshold Road (content warning..)
Iragon
Fallen Doll (original and Operation Lovecraft)
Sayaka Relaunched
Last Hope
Overtopia-3D (imo, seriously underrated game)
Real Life Sunbay
Slaves of Rome
Sexbot Quality Assurance Simulator
BioAsshard Arena (possible content warning..)
LifePlay
Mahou Arms
Monster Girl Garden (interesting game, very little directions)
Wild Life (the reigning King of Unreal Engine adult games)
Breeders of the Nephelym
Kalyskah (my personal favorite)
VR Titties (give it a shot, decent effort short of something like VaM)
Magical Investigation of Meridiana (hell of a game title but totally worth checking out)
