The OP mentioned stealing in the title, so maybe the idea was more for something along the lines of netori/netorare
Its sort of like "Reverse NTR" in a sense. MC get's stolen away from some domineering seductress chick away from the MC's primary love interest. Its somewhat rare, because in most NTR scenarios, its the dude that's being cucked by some bull or fat ugly bastard (FUB) who steals his GF/significant other.
Yeah true, those games I mentioned are kinda "
netorase" in a sense. Maybe not "netori", because the protagonist isn't really stealing away another's love interest in those games, unless (assuming of course) the girls that the FMC want him to have sex with have either BF's/GF's that are unaware of the MC's relationship with their significant others.
Sanguine Rose has a path where the MC betrays his friend and fuck buddy and is "corrupted" by another woman
Yeah, this game is also something the OP would like to check out as well.
One other suggestion that I would make is
Radiant I believe earlier in the game, you go on a date with the FMC and some girl (Violet or Vanessa, can't 100% recall her name) steals the MC away during the date. And there's some blonde coworker chick that tries to steal MC away from both the FMC and Vanessa as well. So might be something worth looking into as well
ALeakyWarthog
Lastly,
Race of Life and
Nothing is Forever might also touch upon this "reverse NTR" twist.