Before my SO and I were together she had a reputation in HS. We met end of senior year and she tried a monogamous relationship with me. Senior year at uni I was busy with school work and working part time with little time for us. We lived together and split the rent. She was constantly hit on buy guys at her work.

Eventually all that took a toll on us and she took a ride home from another guy, cheated and came home 5am. I was angry but rather than argue at that time or figure out one of us moving, which neither of us could afford, I said I'd move to the guest room and stay best friends, thinking I can play the revenge long game.

With no social or sexual outlet my idea of revenge was giving her solid advice that lead her down a path of bimbofication, especially since she said she was pursuing another long term relationship and I didn't want to see her get that. When she asked for dating advice I gave her good advice mixed with pandering to the guy's wants and desires. When she asked my help in making a dating profile I told her to buy sexy clothes, I'll do a photo shoot, helped make her profile, turned the profile to private / access by links only then looked for local guys interested on a big breast webforum, coached and sent the link. Risky and despicable though it turned out she really wasn't looking for long term relationship material after all.

I gave her solid sex advice based on what I like along with encouraging her to be in touch with her sexuality and try new things with men. I went shopping with her during income tax season in a ritual where she got rid of all her old clothes for new eye candy wear.

This was my outlet for a year and a half. I realized it was a mix of me transforming her and her reverting to her old self before she changed for me. She was the girl I met when we first dated and I didn't want her to have to deviate from that so we rekindled and have been enjoying exploring her sexuality through cuckolding.