A year after rescuing Twilight Sparkle and her friends from Queen Chrysalis, Starlight Glimmer is awoken in the early hours of the morning by her marefriend Kyra's terrified screams. Upon investigation, she finds out that Kyra - for some inexplicable reason - has suddenly sprouted a penis. Things quickly escalate hilariously after that, as the two try to figure out what could possibly be behind this phallic phenomenon.