Kyber Crystals are special, he knows, and he just assumes that has something to do with it. He'd keep going, but Jyn reaches out and pulls his hand in, and the crystal is more or less forgotten.

He settles it immediately on Rey's back, trusting that it's fine even before Jyn says so. It also lets him scooch down to something more eye level, rolling on his side to face them, and he likes this much better. "I wasn't sure the best way to ask."

It's not like she hasn't fed Rey in front of him before, but it felt different in the quiet of their room. They made a literal human being together, but boundaries are still hard, ok. He traces a light, easy circle on his daughter's back and feels her relax more under his touch.