Enthralled

ENTHRALLED is a hypnotic game about getting seduced and mind-controlled by a demanding vampire queen, played by the Secret Subject! The full game lasts for 45-60 minutes, while the free demo lasts for 15-20 minutes.

It uses real hypnosis and toys heavily with D/s dynamics, fractionation, obedience, getting turned into a vampire's mindless thrall, being told to resist trance (and failing), and being made to wear a collar.