Just like usual, Han Dongchen helped Su Xiaowan to her feet, dried her body, and helped her into her pajamas before letting her go. He stayed behind to drain the bath.
Su Xiaowan didn't feel anything different, other than feeling a bit hotter than usual. She also noticed Han Dongchen intentionally or unintentionally touching some indescribable parts of her body when he was drying her.
This made her feel a bit uneasy but seeing Han Dongchen's indifferent expression, Su Xiaowan didn't overthink. It might not have been intentional, or maybe the weather was just too hot.
After Su Xiaowan left, Han Dongchen felt unbearably hot, unable to suppress his physical reaction any longer. He was in so much discomfort that it was almost painful.