I can't recall what in was called to save my life. But I do remember it involved Dusk Shine and the mane 5 mares. He ended up getting them pregnant, and decided to marry them(I also remember that Dash was bummed because the Wonderbolts in story required one to be of a Noble family).

6837814
I think the story you're talking about is the Mr.Twilight Sparkle story by AnnonyMouse

https://www.fimfiction.net/story/58036/mr-twilight-sparkle

6837823
Sonofagun that's it exactly. Thank ya kindly.

6837838
You're welcome