Even if Tess feels otherwise, as far as Sarah sees it this is still a huge favor. "Alright, I guess. I still mean the thank you though."

She'll let it drop for now, but if all goes well and Tess doesn't turn out to be some kind of crazy person, Sarah might just find a sneaky way to make it up to her. Slowly she cracks the door open a little more and motions for Tess to come in.