Here's an alternate idea.
Instead of spending money on a different bike, do several track days... but keep them a deep dark secret. Don't let your boyfriend know.
Learn how to REALLY ride that Ninjette.
Then, one fine day, go for a ride with him. Choose a twisty road where he won't have as much of a horsepower advantage.
Then, when he least expects it.....
POUNCE!!!