This developer in particular tends to develop optional prostitution-to-netorare side-plots.
Currently the maids can (optionally) be whored out to an antagonist character, and if that option is selected often enough they'll probably be "lost to" or develop "affinity with" the guy or something. Someone commented earlier that the event is called "Az'ea First," which would also fit a pattern in the dev's works--where some character who can't be whored out by herself will "fall" if enough of the controllable heroines do. If that's the case then Az'ea will either start initiating events with the antagonist as the maids fall or once they're all lost.
This is an assumption though. For all I know that could be dependent on other stats entirely, like portal activity or love, lust, or obedience checks during specific events.