[Considering it's not an order Yato has an qualms about answering, he merely goes ahead and returns to running the hairbrush through BB's hair, knowing full well by feel alone that she's of a similar existence to himself.]

Yeah? I've spent most of my life around humans, although few could ever notice me. Thankfully I did have someone who'd do mine on occasion, though, so I can't blame you for craving it more often. Maybe you just need to find the right kind of friend who'd be willing to trade that favor for one from you.

[Again and again the brush goes through her hair, making sure there's not a single knot or tangle to be found.]