Title: Mind Over Mane-iac

Main characters: Zap, Mane-Iac.

Genre: Romance, Dark(NSFW), Slice of life.

Premise:
Normally Zap has never been one to restrict herself with 'marefriends', but one day she finds herself falling head-over-hooves for a mare named Tresemme. Under the secret identity of the 'Firefly', she begins an open relationship with the beautiful mare, but she can't help but feel there's something familiar about her...

Months later, while trying to stop the Mane-iac from robbing a bank, she menages to corner her while the rest of the Power Ponies fight off her henchmen. However upon doing so the Mane-iac simply proceeds to reveal several secrete facts about her that only Tresemme knew, stalling her long enough for her to get away.

Firefly confronts Tresemme about the matter, to her shock she doesn't deny anything, revealing that not only is she the Mane-iac, but even offers to call the police herself. Despite her duties as a hero, she can't bring herself to turn her in...

Will Zap fall to her marefriends seductive ways? Or can she convince the Mane-iac to have a change of heart?

Challenge taken.

3319553 Was it ever truly established that Mane-iac was originally named Tresemme? Or is that just a headcanon? I know I've seen it at least twice somewhere.