Prompto might actually manage to make Noctis jealous when he tells him what the cheese throwing incident resulted in. It probably wasn't what the prince was aiming for.

Now that selfie was unexpected. "Hey, you're supposed to give fair warning for those, how do I even know you got my good side?" He reaches out to put his arm around Prompto's shoulders to pull him close. "Do it again. And I give you permission to post it to impress your followers."

And he might even sneak a little kiss to the side of Prompto's head while he's snapping away, just for the followers, of course.