How can I make him confess?

My guy friend likes my boy best friend. He likes him too but he has never been in a relationship with a boy before so he’s scared :( . I caught them the other day they were literally about to kiss and today i took a picture of them. (Guy on the left is my bestie:)) He’s literally so stressed out about this. How can i make him confess?
How can I make him confess?
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He’s the blond one***
How can I make him confess?
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