Every pony deserves a happy ending; every pony deserves to be equal. At the end of time, Starlight Glimmer wanders the desert in search of a way to give them both... but if forced to choose only one, she already knows what she'll do.
Rarity has a hypothesis: color synergy between lovers' coats increases the odds of a successful romance. Twilight is good at testing hypotheses. What's that? Test it themselves? Nah. They're gonna make Rainbow Dash do it. (RariTwi)