I just got this really weird idea.
You know how Soifon's completely obsessed with Yoruichi? She could see this as her chance to get with her, and all she'd have to put up with is the ryoka, Ichigo.
As soon as she hears about this she could be fuming with unsurpassed anger towards Ichigo, as expected, but doesn't act on it by trying to kill him, which isn't expected. Instead, she meditates and comes to the conclusion that if she became his 'Mistress' (with nothing actually happening, of course, because her body(ectoplasm?), soul, heart, and mind are all Yoruichi's) she'd have an excuse to protect Yoruichi from Ichigo (who Soifon sees as a pervert and unworthy man, much less person, for Yoruichi), as well as hook up with her.
Again, just a crazy idea that would probably go well into a humor fic, as well as any crack fic.