Top of head:Sibling affection/parental affection
Nose:"You're so cute."
Fingers:Friendship/amicable
Thigh:Sympathy/empathy
Stomach:Fun!/Silliness/"Wanna go cause some trouble?"

✿ | “—!” After those gentle touches, Yuzu ends up frazzled, putting her hand on her head, and then on her nose—and then the next. Wha…What does this mean? Some sort of a code…? “Um…did I have something on my head?” Way to be casual, Yuzu.