This is the story of Twiska, who is a succubus. (A Succubus is a demon who takes the form of a highly attractive woman to seduce men using dreams in order to have sexual intercourse)
Twiska enjoys visiting local towns and draining the villagers of their cum. Everything is going along well until she encounters Theo, the legendary Hero destined to defeat her. Theo is a cute shouta and addictively good at sex. Now Twiska isn't sure anymore whether she wants to kill him or keep him for herself.