For the sake of their Master whose libido is just excessively strong, the days when Chaldea becomes a place of both sexual relief and mana transfer will begin...

At first, it was also what Jeanne Alter confidently desired, but she easily got the tables turned on her due to his monstrous energy. She's unable to forget the pleasure she experienced just once, but she and Master didn't do it again for a few days. In Jalter's room where she's turned into a masturbation addict, eager and thirsty for cock, she waits for him to show up.

Gudao is the master, but he's got a bit of a playboy streak in him this time.

(Source: DLsite)