He tugs on the ginger's jacket to let himself be known (no blasting the elf, please) and smiles. Without much warning, he jumps at Claus and clings. This was simply to place his hands on the other's cheeks and squish them. "Duck face! Honk honk!"
Claus takes notice of Link only after he takes hold of his jacket. He glances down to his friend and opens his mouth to speak, only to be suddenly ambushed by the other, catching him completely offguard. That spooks him a little, but nowhere near as bad as that time Link had randomly jumped on him from behind, so he recovers from it quickly, though a look of confusion stays planted on his face.
Then, Link takes hold of his face and squishes it. Claus pulls his head away after a few moments, though his grin is unmistakable. God, how weird… but he can’t help but be absolutely amused by it. He places his hands on Link’s shoulders as he laughs. “Wh-What?” he asks through his giggling. “What was that for?”