"No," You said, feeling confused and surprised, "How could you be? You train humans to fight your kind, how does Satan let you get away with it?"
His green eyes bore into you, "That is a long story, but Assiah is my home. My loyalties lie within it. That's all you need to know right now."
You stared back into his eyes, something about them always drew you in, you felt as though they had power over you. "So, you weren't trying to kill me with Amaimon's little pet?" You asked, folding your arms and pursing your lips.
Mephisto cackled, throwing his head back and clutching at his sides. You pouted harder at his response. "No, no, why would I want to do that? You're much too fun to simply kill!"
A cold shiver ran down your spine, you were relieved to find out that he hadn't wanted you dead, but his response made you feel expendable. "Will you kill me once you get bored of me?"
He stopped laughing and a serious look appeared on his face, "No, but who said I'd get bored with you? You have plenty of ways to keep me entertained". He bent over the table so that he was closer to you, freeing his tail from his clothing, he pressed the tip lightly against your lip and trailed down to your cleavage. A smirk appeared back on his face and you noticed a hunger in his eyes again.
You gently gripped his tail and he visibly shook from the contact; you knew the power you had over him while you held onto it. Standing up, you walked around his desk, still holding onto his tail. Mephisto stood and rotated so that he was facing you. You pushed him back so that he sat on the edge of the desk, his eyes widened as you gently tugged on his tail.
"Okay, King of Time, I think it's my turn to test you". You lowered your head and brought your mouth close to his tail and tickled it with your tongue. A noise you'd never heard him make escaped his mouth as he closed his eyes, the level of trust he put in you in that moment was a huge turn on. Very gently placing your teeth around his tail, you bit down, slowly and softly. The demon's eyes shot open as he watched you, it was the first time you'd ever seen him look scared.
He immediately masked his fear with a more stoic look. However, the way his hands gripped the edge of the desk tightly told you all you needed to know, he wanted you to think he wasn't under your control, but his actions told you otherwise.
You bit slightly harder and Mephisto's body went rigid, his hips bucked forward, and he whined loudly. You noticed his cock was hardening as you worked his tail.
While keeping his tail between your teeth, you carefully ran your fingernails along the remaining part of it towards the base, going against the grain of the hair.
"Be careful." He whispered a warning.
You released the tail from your teeth, pinched the base of it between two fingers and slid them all the way down to the tip. His cock pulsed underneath his clothes and he continued to whine. Suddenly, you let go of his tail and walked away from him, "Well, I best be off. I have to be up early for school tomorrow".
Mephisto's jaw dropped, staring at you as you walked towards the door. Snapping his fingers, he appeared in front of you, blocking the door. "I don't think so," he said in a low growl, "You can't leave me like this!" He looked down at his cock.
You smirked, "But Sir Pheles, I must get a good night's sleep if I'm going to be a good student!"
He walked closer to you, a dark look plastered on his face, you could smell his arousal and it made your pussy wet. You laughed and backed away from the demon, turning around you ran towards his desk. After only taking a few steps, you fell to the floor as he pounced on you. His arms wrapped around you so that you didn't get hurt from the fall.

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Sir Pheles' Plaything (Mephisto Pheles x Reader)
FanfictionA simple summer break visiting a cousin takes an unusual turn as you're forced to face your fears and your future. Mephisto Pheles introduces you to a world you were previously unaware of, will you stay or will you run? A mature 'Blue Exorcist' fanf...