Inigo laughs at that last part, though perhaps with a tad of awkwardness sprinkled in considering he's only now realising that right, he's totally keeping Gladio off cleaning! Inigo's such a blabbermouth that he hardly realised it until now. Thankfully the big guy doesn't seem upset because of it.

"Sure. I'll make sure to bring a helmet." It's a joke, okay, he's.. at least pretty sure Gladio isn't just going to knock him around! "Then I'll see you again later. Good luck with cleaning."