You had saved the life of Octavia Goetia, after she was abducted by human demonologists, and had returned her to her home, and her father. Holding to the rule of reciprocity among the Goetia, Stolas needed to offer you something of equal value, and opted to give you permanent employment among his staff. While your official title was that of bodyguard, he had no scruples with treating you as a personal assistant or entertainment when he was bored.
Which is why, on your day off, you were surprised to find yourself dropping through a portal, onto the floor of Stolas's boidoire.
"Ah, wonderful. I was beginning to get bored. And it's soooo lonely in this huge, beautiful mansion sometimes."
Stolas drawled, lounging along a chaise, one long, thin leg bouncing up and down, his long tail swishing over the armrest.