A mixture of all of them (Corrupted Titans, nudity and watersports)

OK, you've chosen to:

Reverse their morality so that they'll be willing to conquer the world for you.

Completely remove any trace of modesty.

Lower Raven and Starfire's IQs by 5%, and boost Terra's by the same.

Make them believe that when it comes to importance, you are above all others, followed by your slaves, then other powered individuals, then non-powered men, with non-powered females being at the bottom.

Make them wholeheartedly want to be your slaves for life.

And reverse their toilet training. They'll think nothing of relieving themselves wherever they are, without even pausing whatever they're doing.