At the very least it'd be an entertaining injury to explain. Most of the blame, really, is on the cramped bunk.  The Falcon wasn't really designed for comfort and these weren't really designed for two people.  Not that it's going to stop them.  

He's very willing to be led, shifting back up for that kiss eagerly, hands still warm on her skin.  In answer she gets another little smile.

"We can do that," 

And, see, her size isn't a problem at all, because it means it's easy for him to reposition them both, shifting to stretch with his back pressed to the wall, tugging her alongside him.  A little precarious given how narrow the mattress is, but this isn't the time to be shy.