[It's probably just as well they're in such close proximity, if only so Byleth can't see how much Claude is blushing by this point. But as Byleth shifts on the bed, Claude winds up putting a hand on his back, just in case -- given how narrow the bed actually is -- he slips and falls off, Claude can try to catch him in time.

Fortunately, that doesn't happen, so he just holds still, hoping it isn't too obvious that his heartbeat quickens a little when Byleth presses his cheek to his skin.]

Well, I do feel it sometimes. After a battle or a tough training session, something like that. Most of the time it's just something I don't notice, though, like breathing.