Arryn and Stahl married their crushes x
Ok, serious answer is that because of their jobs, the two often go months without seeing each other which can be difficult to say the least so they make what time they do have count and make it perfect. The distance is why Avian is an only child and grew up a lil lonely instead of having 5 siblings.

As for Avian himself, he doesn't want to be a burden so usually just be kind to them and help because he wants to rather than because he has to. He'd be too worried about hurting the other person to initiate. However if the other person was to initiate he'd probably be flustered as hell but not say no~