From source

*complicated relationship*

I’m not really into MLP ships but there is still some of them I really like!

ThunderDust is one of my favorite for now and I’m kinda obsessed with it :“D  

Aaaaaand I have headcanon for their relationship   

Thunderlane helped Lightning Dust after she was kicked out of Wonderbolts Academy. He saw she was trying her best and he thought it was unfair.

After a while, he became her only and closest friend. Lightning was depressed but she trusted Thunderlane and was kind with him. They spend a lot of time together and he helped her to recover. They got together after two months of friendship. 

Surprisingly, Lightning Dust was really soft and cute in relationship. 

But once she got better her complicated character started to show again. Lightning suddenly became very privet and started to push Thunderlane away. She decided she must be the best at everything. Aslo she couldn’t stand Thunderlane became Wonderbolt.

It hurts him a lot but he understood.

But then she started to risk her life without any reason he got worried about his girlfriend a lot. And he tried to reason with her. Thunderlane told Lightning Dust he loves her and he can’t see her self-destructive actions. She got up in arms (hooves) about it as you can see…