Yes, there are. I've forgotten all of the actual names as I haven't used a PC since spring, but there are a few.
The one that I remember, work in progress, NTR focused game yet optional, might be called Seeds of Chaos or might not.
It's made with ren'py, MC is a hero after killing the demon king, happily married with the heroine.
Demon king kids come by, massacre village, kidnap both, force hero to work for them with wifey hostage and demon dude trying to nail her.
You take control of MC, raid, loot and conquer.
Note that beside the optional NTR, there's also optional gay demon dick. Make yer choices with care, if you can find the game that is.
From what I vaguely remember, another conquest game is Overwhored. Dark lord summoned from the grave and stuff...
There's another one where you take control of an ork and chase down heroines as you pillage villages and stuff.
"Ork/orc" might be a part of the title... It's rpgm or "other" when going by tags.