@FeatherTrap  
I mean, obviousness is obviousness.
 
They’re most likely either fighting over him or Trixie’s just teasing Starlight, which is something I’m pretty sure we could see her doing.

@chubbyninja89  
I think you could interpret it either way, honestly~ :3

@FeatherTrap  
Too bad it’s clear they’re fighting over Sunburst.
 
Though I’d think Trixie is just doing it to tease Starlight.

@furrypony  
I agree with this comment~ ^^

It looks to me as if Trixie is pushing Sunburst to hug Starlight, and Starlight is like “nope” and pushing Sunburst back.

@Magic Nova  

 
And Bobthedalek’s image comes full circle XD

“My butt hurts.”

This is why OT3s exist.

@hironakamura
 
Yeah, I think Trixie is just teasing Starlight so that she’ll just confess her feelings to Sunburst.

Weather its romantic or not, its canon that Starlight is emotionally affected when she finds she needs to compete with someone else for Sunburst’s attention. The image suggests Trixie likes teasing Starlight this way or she’s open to the idea of sharing Sunburst.

Starlight: Trixie, Sunburst is mine and mine alone!  
Trixie: The Great and Powerful Trixie disagrees. Why can’t Trixie have him?  
Starlight: Because we were meant for each other!  
Trixie: Trixie thinks that’s not a valid reason…  
Then Sunburst starts getting pulled towards Twilight.  
Starlight: Twilight! Leave him alone!  
Twilight: Why? We have so much in common!  
Starlight: You know how much I love him!  
Twilight: Well, you ain’t exactly making any moves for him so he’s fair game and also Sunburst is the only chance I have to get my mother off my back.  
Then Maud grabs Sunburst as well.  
Maud: Me too.  
Starlight: Well tell your mother Twilight that she’s already got Flurry Heart and Maud, tell yours that she’s got three other daughters to ask for grand-foals!  
Trixie: Enough, Sunburst is for Trixie and Trixie alone!  
Sunburst: Don’t I get a say in this?  
Starlight No!  
Twilight: No!  
Trixie: No!  
Maud: No!  
Then Starlight physically grabs Sunburst by the flank and pushes the others away.  
Starlight: HE’S MINE!  
Twilight: o_o  
Trixie: o_o  
Maud: o_o

Why there isn’t cute tag?

@Crossbow1701  
That would be the optimal solution.

Stop fighting over him and just both of you bang him.