The "corruption" route was intended when the game was in it's early stages, now the game is oriented toward the romantic route ( being it a harem, a faithful route with one single girl, or more than one but not all).
The only real corruption route remained is to transform Bella in your slave ( she's the only one with that route due to the bumpy start of your new relationship, so the player can choose if he want a romantic relation or a submissive one) so that word doesn't need to be interpreted literally anymore ( Perverteer didn't feel the need to change it).