Why does his son lately walk in on us?

I've been casually seeing a divorced guy for 2 months. He told me a lot about his son and that he always walks into his room early in the morning to snuggle with his father. Since I left rather early I never happened to see him however lately he keeps walking in on us at midnight and crawls under the blanket so that his father lies between us. I even saw him sneak a glance at me over his fathers shoulder. Now every time I visit him he joins us at midnight without saying a word and he never talks about me the next day. Why does he do that? by the way he is 7 and quite smart

Why does his son lately walk in on us?
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