He said your hair was smelly and oily, so you told him to wash your hair once a day, which he did. After all, the two of them are a team, and they can't just care about their own feelings. Later on, they become even more pampered. They hug him no matter whether they wash or not, and they smell his hair and say it smells so good. At this time, the novelty hormones no longer burst out. It's the unique smell of secretion.
Purpose: To practice good neighborliness and friendship