You and Rin are in front of the sink mirror, as usual washing your face, brushing your teeth, etc.

After you and Rin had finished washing your faces and brushing your teeth, you immediately wanted to go to bed, but suddenly Rin grabbed your arm.

"You haven't put on lip balm yet."

When he finished speaking in his usual stoic tone, you immediately realized what he meant. You put on your lip balm and tiptoe in front of him, he holds your jaw with both hands and presses his lips to yours.