When they do the quest for Dino at Galdin Quay, I can see Dino hitting up Gladio, like making innuendos and generally just trying really badly to flirt with him until Ignis gets fed up and just kisses Gladio right there

+10 if it was a spur of the moment thing, surprising literally everyone

+100 if there's a "Do it for the vine!" yelled courtesy of Prompto who obviously got the whole thing on his phone