Annabeth lets go of his hand in favor of holding both his shoulders, and she leans in even more, till there's not that much space left between them at all. Especially with the shift in the way he's kissing her, because suddenly her own want is there, too, underwater or otherwise. It's not like Tartarus will ever really go away, but all things considered, this moment right now is probably a good sign.

She smirks, kissing him a few more times before speaking up again, one her hands snaking up to thread through his hair. "A couple of ideas. But it's a surprise."