This is a record of your perverted sex with the lewd lusty girls of an all girls school. As the ONLY guy... you are tasked with the duty to take care of alllll~ their pent up sexual frustrations.
The setting is a "delivery health" (dispatch brothel) service where all the girls are from "Isekai" (other worlds), and it would seem that semen is the only source for replenishing their mana in this world.
I will obey you, Mistress — is a relationship simulator. You play as a 19 year old boy who was taken in by Mary. Mary becomes your Mistress and does whatever she wants with you. She makes you lick her every day before going to university and satisfies her many sexual mischiefs.
Certain family circumstances have lead to you living in a women's dorm. The girls there want you to have a memorably nice time... get ready to get spoiled!
A weary corporate sl*ve, found himself unexpectedly transported to an Isekai during overtime work. Embark on an exciting adventure as a wandering traveler in this fantasy realm, wielding the powers of a "Demonoid" to conquer the hearts of the girls.