Rarity and Spike have been together for a while. He never had a problem with sharing her with Pinkie Pie, but can Spike handle the responsibilities of becoming a father when he finds out that Rarity has impregnated Pinkie? And how does a mare impregnate another mare anyway?

There has been some confusion regarding this story, where many people think I am ripping on Spike. I'm not really, but I'm starting to understand why people think that. Rarity is not cheating here, it's something called polyamory.