Shayla Plainheart and Gavin Ashmore grew up as blood-unrelated siblings. Since they were close in age and came under Quinn's patronage at almost the same time, they quickly became good friends.
It was unclear when it started, but as they grew up, things started to change. Shayla's feelings shifted from familial ones to romantic ones.
Unfortunately, Gavin did not share the same sentiment. He instead fell for the timid Maya Greenwood, who Shayla always considered a goody two shoes.
When Gavin was found guilty of harassing Maya, it was Shayla who helped him to escape from the pack house.
Alas, he was captured fairly quickly. When he was then kicked out of the Infinite Eclipse Pack, Shayla was heartbroken.
In Shayla's opinion, it was Maya who acted coy around Gavin. Maya misled Gavin completely, and Gavin fell for her charm.
Shayla then begged Quinn to put a good word for Gavin in front of the Alpha, but Quinn refused to.