Nemesis

Monster-shaped things called Nemesis have been snatching girls off the streets since 2099, and nobody's found a trace of them since. Riley, fresh into the secret agent gig, gets stuck chasing down the source of it all with his superior Emily, and the tone here is a lot less serious than that setup suggests.

The twist is Riley himself: a trap, not a futa, and the one actually meant to get dominated and corrupted as the story moves along, first by the futas he crosses paths with and eventually by the Nemesis he's supposed to be stopping. The game is upfront that this is still early days, so most of what's here is setup and investigation rather than payoff.

Right now that means reading through Riley and Emily's introduction to the case with basically no sex scenes attached to it yet. The developer's said more content involving Riley is coming as the game grows, but at this stage the mission is the prologue, not the corruption.