The old adage that a man stallion grows up to marry his own mother applies so well here as well as the reverse, a woman mare grows up to marry her own father… XD
Someone theorized that Starlight and Sunburst may have been switched at birth. Or they like each other because they remind each other of someone familiar. Maybe. I read most people marry other people that remind them of their parents. At least subconsciously.
It could get weirder. Starlight could try to get Sunburst to treat her like a filly by transforming into one for the purposes of..staying closer to each other..oh, right.
manstallion grows up to marry his own mother applies so well here as well as the reverse, awomanmare grows up to marry her own father… XD