Oh, Vrtra and Roku are actually very close! I always forget to talk about this lol. Essentially, it all boils down to remembering that Midgardsormr did, in a way, consider Roku as one of his own. Its not too far of a stretch to say Vrtra would've known about this one way or another. At the very least he knew they were very close because he could sense Midgardsormr's aether in him (its what powers roku's drg abilities.) And Roku is very honest, he probably would have told vrtra that Midgard is the closest one he had to a father when they talked about him in radz-at-han. I think this automatically sparked a kinship between them. I even think Vrtra would have referred to him as "Kin Myhk" or "little brother" when he was urging him to be safe on his journies to stop the final days.

BUT ANYWAYS. Since then Roku has often taken trips to Radz just to speak to Vrtra and be with him. They have gotten pretty close, and I think Vrtra having Roku to confide in after Ahewann's passing is something he would appreciate. Roku loves him! Theyre like, brothers. I always get embarassed about my "midgardsormr esentially adopted him lore" but I think its something Vrtra and Roku just kinda fell into on their own. He always gets excited to take Vrtra (through Varshahn) out to...simply enjoy life. He'd take him to the beach and ask him what he thinks of the sea breeze, or the sand between his fingers. He'd ask vrtra to show him the markets and let him ramble on about how proud he is of his people. Knowing that Vrtra lived a lot of his life in hiding, he simply wants the best for him, and to see him enjoy the land he helped found. To take a breath and realize he truly doesnt have to hide anymore. And Roku has taken to learning as much about the first brood as he could, and when roku tells him about his childhood beneath the sea,Vrtra will regale him of his own childhood. The youngest of the first brood, and Azdaja especially.

THIS IS ALL TO SAY. Yes they are very close and they do love each other a lot. Their both gentle souls I feel, so it came rather easily to them. Also, Varshahn absolutely attended his wedding in ishgard! I like thinking about them it makes me :]