Super adorable!!!

Noctis:

He’d be a little disappointed through out the day when he’d see them cover their smile every single time they smiled or laughed. But he wouldn’t ask about it, knowing it’d probably make them even more self-conscious. He’s well aware of their feelings. 

This causes him to fall in love with waking up next to them in the morning. (The only thing he loves about mornings really.) (Also, Noctis does make it a point to sleep next to them, because they sometimes cuddle in their sleep and like hell he’s missing out on cuddling.)

Sleepy mornings where they’re both allowed to take them time waking are the best because they’re too sleepy to hide from him. 

It’s during this moment that he’d allowed to see their smile in all it’s glory. And he’d probably subtly make sure their hands were trapped between them, or maybe even behind him if they’re cuddling, just so he could see it just a little longer. 

Once fully awake they’d start covering their mouth right away again, which would cause him to sigh, but smile to himself. (He’d hope that one day they’d trust him enough to smile freely around him.)

Prompto:

It would only be a habit from a long forgotten past that would keep their hand rising to their mouth. He’d tease them about it, but they wouldn’t be able to break their habit. 

It’d soon start to drive him UP THE WALL. Like, even though they’d been friends for so long, HE’D NEVER SEEN THEIR SMILE. He’s sure it’s cute and sweet, and irresistibly adorable and he just really really wants to see them smile. 

So, he’d decide that he was going to make his crush laugh and smile. ALL. DAY. LONG. Like, the day is filled with 100% percent jokes, gags, tricks, and banter just for them. Because they’re bound to forget hiding SOMETIME. Right?

(The other three know what’s going on, and play along to help him.)

But ti wouldn’t work. In fact, they’d completely hide their face when they laugh too hard. 

Eventually, when they have a moment alone he’d say, “That’s it.”

And before they can question what he means, he tackles them, pins them down, and tickles them after trying and failing all day to make them smile without their hand in the way. HE WANTS TO SEE DAMN IT.

They’d probably shout in surprise and then start uncontrollably smiling and laughing. Which also dissolves into threatening him. “J-Just-You-WAIT-PROM!!!!!!”

He finally get to see their smile and basks in it for about five seconds….and then realizes what he’s done. He goes PALE.

He, unfortunately, is WAAAY more ticklish than them. So he darts away while they’re catching their breath. IT doesn’t take them long though, and they catch up with him and gets their revenge. 

(He finds he doesn’t really mind though. They’re smiling all the while.)

Gladio:

This guy, after every laugh and smile, will make it a point to touch some part of his crush if they’re self-conscious enough to hide something a beautiful as a smile. Be it their shoulder, their hand, maybe their face if they’re that close at the time. 

Instead of forcing it like Prompto, or stealing moments like Noctis, he’d the one who will wait for them to show him. And he’s very patient.

He’ll be the most attentive one, even beating out Ignis. He’s going to make sure to compliment them every time he even thinks they’re doubting themself. Make it a point to glance away from them if they show signs of wanting to hide. And close his eyes when they’re alone together so they don’t feel the need to hide.

All this to slowly build up their confidence and trust in him until one day, they smile openly and freely. (And in his opinion, it’s the sweetest smile he’d ever seen.)

Ignis:

He’s definitely the sneakiest one of them all. While he’d respect his crush enough to wait for them, like Gladio does, he’d also going to follow Noctis’ method and steal moments of their smile for himself.

He’d make sure they’d be alone (Perhaps just spending time away from the others) and hold out his arm for them to take, just being a gentleman, so they’d be close. They’d be able to lean their head on his shoulder as they walked, which suited him fine. The closer they were, the better this would work.

Then, he’d try making them smile with silly thoughts and what if scenarios. But since they’re so close, he can see a bit behind their hand, to the smile hidden there. 

It would be a like a small preview, a gift really, of what he had to look forward to in the future. He treasures those stolen moments really, and sincerely wishes to be the first to see their smile uncovered.