Fell!Sans

Sometimes you think about what the behavior of underground monsters would be like when they are living with humans...but you preferred that that just remain an idea since you didn't want to risk it and have the humans get hurt by the bad behavior of the monsters. Your thoughts were interrupted when you heard the door of the house open abruptly, you looked out and saw that it was Fell...and he seemed in a bad mood. "Tch, that fuckin' idiot...who did that guy think he was?" Fell muttered to himself and sat on the couch, you thought about calling Papyrus for this situation...but he wasn't home, he left with Undyne. So you are alone with him. You thought about leaving him alone, but you didn't want to leave him in a bad mood, so, you walked down the stairs and slowly approached him. Although he have already noticed you, he looks at you serious and talks to you in a grumpy way. "What?" He tries to act normal so as not to raise suspicions...but you know he's upset for something.