Mulder watches her watch him and finds himself, not for the first time, wishing he could see everything inside her head. Wheels turning within wheels, every brilliant little thought that passes through her mind but doesn't reach her mouth - she's full of tiny secrets, even after working with her for years.

"Oooh, kinky," he teases, taking the mug from her hands as he leans in to peck her on the mouth. "I'll meet you there."

With fresh brew in the cup and a coaster in hand, he walks into Scully's bedroom like he owns the place. That stops right about when he gently sets coaster down on the bedside table and the coffee atop it, but he's starting to find a place for himself within her inner sanctum.