[ Opening his mouth then... when it becomes obvious that all he's going to do is make whimpering noises, closing it and biting his lip again. He keeps half-breaking eye contact— looking away then glancing right back, then looking away again, then back, caught between being flustered over it and being really really super turned on over it. Either way feeling is still happening, so Sion does get to feel when his fingers curl up or twitch or tremble. ]