His only response to that comment is a little helpless giggle - he's vaguely ticklish just imagining it, and he tries to keep himself from moving around by letting his thoughts wander, shutting his eyes and enjoying the feeling of soft kisses against his skin.

Yes, that first night. That first day here, really. That night before, full of restless sleep, where he had wound up upside-down in a bed like this one, so troubled-

The question pulls him from his reflection, and he looks down to Herbert in confusion for a moment before realizing what he's talking about.

"Oh - that? Just a birthmark, I was born with it. Mother called it my little star. I usually wear tall socks, and it's in a funny spot, so you must not have noticed it before."