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Summary
It had been a simple experiment. Twilight and Starlight were working on a spell that changed a pony’s genitalia for the benefit of transponies, and they’d stumbled across a spell that would give a mare a penis. Deciding it was a logical first step in their research, Twilight volunteered to be the test subject.
She did not count on not being able to get rid of it, nor did she anticipate all the ways it would change her life.