Jarek's been thinking about the risk--or potential?--if he should be taken for a Redfang since the beginning, but he knows he's not the most subtle creature, and he worries that just standing out of sight might also be taken for 'lying in wait'. No, if he's going to be non-threatening at a glance, there are more direct signals.
When the door opens, if the answerer should look to the side, under the window, they see Jarek lying on his back, shirt open to emphasise his unarmored vulnerability, his hands up to cradle a kitten that is unsteadily deciding whether to nap on his sternum.
It really is a tiefling. Unexpected. And green, likewise. Illusions? More secrets yet unexplained? At the cautious invitation, Jarek palms the kitten securely, hops to his feet, and slips inside as quietly as he can. He leads with the kitten, like a lantern to guide the way or a charm to ward off malevolent spirits, and stays close to the door.