He's been expecting Finn to say something since Rachel sang that song that was obviously directed at him. He rolls his eyes at the threat before turning to Finn and giving him a nod that's serious, but rest assured, he won't be hurting Rachel, at least not intentionally.
"Do we have your blessing now? You're my best friend, dude. I don't want us to fall out over this..."
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"Do we have your blessing now? You're my best friend, dude. I don't want us to fall out over this..."