Well the running gag for my Pinkie was that she’s oblivious to any sort of romance. She has no clue why Rainbow flew off but she felt like she did something wrong.

I was gonna make Dash confess her feelings to Pinkie.

For the sake of her friend’s happiness Pinkie innocently agrees to it and it would have been small snip bits of her eventually warming up to Rainbow. 

I would have saved the first kiss till the very end when the relationship was realized.