"You can let go of me, Louis," Reyn said with a smile because Louis didn't want to let go of her yet. Louis had been hugging her for two days. At first, Reyn didn't push him away because she needed support. Yes, she was used to sleeping alone in bed whenever she was attacked by her asthma but now she discovered that it's good to be with someone. It's nice to have someone taking care of her. It feels especially good if someone like Louis can be with her to fight the lingering asthma attack.
Reyn is like a baby. He pampered her. She always saw to him that Louis was carefully taking care of her. Louis is alert to her inhaler supplies. If she doesn't recover, Louis is ready to rush her into the forest to take her to the nearest hospital. In the end, she just laughed because of his concern.