Lillian Night Succubus Exclusive Contract

One night, when I was about to start my usual event before going to bed, - a girl suddenly appeared in front of me. - She's... she's flying, has wings and horns, and doesn't seem to be human. - She swallowed my semen in the name of tasting it, and asks me - "Would you like to sign a contract with me?" - What will you do...?​