I often feel the same way when I walk in on my parents kissing in the kitchen or living room. Intellectually I know that they are grown adults and that showing affection is a natural part of love. However, when face to face with the reality of your parents or grandparents actually doing it...is unnerving.

Grandfather again offers his sincere apologies for getting caught by Sasuke. ...that is the exact way he phrased it. They are...vigorous for their age, aren't they?