Between the force skype sessions, the second one is probably the most sexually charged. I will forever love the smuthut scene, though handholding is a different kind of sex, tender and intimate (and beautiful, for sure). This, on the other hand, is raw erotica. He fucking loves that look she gives him, savours every bit of it.
For Rey, this is her first flavour of what lies within the dark, awakening corners of her sexuality. And look at this handsome murderous snake. Kylo’s already all in, eating her with his eyes, offering his best angles, all but eager to strip for her at the nearest occasion. That the scene ends with a splash of water from Rey’s side on Kylo’s mouth, and that slow wiping gesture, like he’s savouring her again, is the fucking most sexual thing in the entire film, second only to their intercourse in the guards fight scene.