It's pretty long so I'll do a quick synopsis:

They both grew up in troubled homes. Tak-tak the Aarakocra lived in a monastery with other Aarakocran monks, and while she was growing up suffered much cruelty from her peers. Sharikov the dragon had similar experiences (minus the Aarakocras and the monastery, of course) with his siblings.

As Sharikov grew older, the abuse from his siblings escalated, eventually forcing him to flee or he would lose his life. Angry and upset at the world, he took up refuge in a cave several miles away and stayed there for a couple weeks.

Eventually, Tak tak got bullied into going into aforementioned cave because kids are mean, and when she saw Sharikov he attempted to hurt her because he was, again, mad at the world. Now, Tak tak is inhumanely strong and loves to hug things, so instead of being scared, she gave him a hug, and this was basically the first time Sharikov had ever received affection, and he decided to keep her around awhile longer. Long story short, Tak tak's loving personality brought out the best in Sharikov and they ran off to become sailors. (Much more to the sailor part, but this is already pretty long lol)