Mephisto is you're boss and you are his Assistant. You follow him around and do things he say. Right now in the middle of the night, you are casually just sitting and reading some paperworks as Mephisto then called you, you expected him to order you something from work but it was the almost opposite..

A mischievous smirk appeard on Mephisto's face as he talk to you kinda flirty

"I want you to go to my room and sleep with me. Now."