Usually Inigo would definitely get pouty at the idea that he isn't allowed to sap at anyone when being a sap is pretty much 90% of his personality.

But.. Senku actually giggled. He seems so happy, and that feels like an accomplishment to Inigo. At least, even with some of the stuff he screws up really badly, there may be one or two things he can still do right.

So he ducks his head, smiling a bit, though with a near-sad edge to it.

"Is me saying I'm glad you're my friend really all that bad? Friends are important, you know. You have to make sure to treasure them while you have them."