Yukino of Fairy Tail

what if yukino chose fairy tail over sabertooth? when she told sting no at the grand banquet he was lost for words.
Sting is shocked that yukino joined fairy tail. He lost his only love. But that doesnt stop him from seeing her.
Yukino knows she made a tough decision but she felt that fairy tail was the best choice for her.
she hid a secret from jiemma. She has under world keys of the zodiac and god keys. she hid it from everyone in Sabertooth. and she has werewolfs souls.
Sting knew Yukino was hiding something from the guild. what he doesn't know. HE finds out one day when yukino saved his life on a job.
When Yukino realized who she saved she tried running from Sting but he caught up to her. He asked why hide it from the guild. she told him because the keys she has are rare and anyone would kill her for them or take advantage of her. but shes not strong. sting asks her why join fairy tail. she told him because she doesnt trust what he told her. saying that you'll treat me better than last time she didnt believe it.
Sting asks if he could give her something.
She said yes.
he kissed her.
what can yukino do when she falls in love with sting but wants to stay in Fairy tail.