Sans' own shit-eating grin spreads, wide and lopsided. Whoever this Gaster was supposed to be, at least he seemed easygoing.

It felt... a lot like the few warm memories still rattling around in his head, actually. Good. Familiar. Like home. He missed it. He missed him, even if he had kinda-sorta accepted the circumstances. Sans said he wouldn't force the idea of his father on this Gaster, but it was impossible not to let it happen to himself. He knew he wasn't going to be able to detach himself from it.

So screw it. He was just happy to have his dad back in some form - one way or another.

"Aw. I thought we were having a moment, here."