In real life, good and decent girls from good families get into some kind of prostitution (porn, call girls, escorts, get laid with the boss to get a promotion... you name it) every day. Sometimes they do it by their own. Sometimes, they are corrupted by different kind of pimps and corrupters. And I can assure you that none of them use change of bodies, magic, hypnotism or mind control to get into the panties of those girls and convince them to become whores. They mostly use personal appeal, charisma, displays of wealth, promises of love and money and parties with alcohol and cocaine where, usually, girls drink and sniff by themselves, aren´t forced or tricked to.
So, YES, it´s possible to corrupt someone without the elements of this game and all the other games inspired (meaning, plagiarizing) the ones of Akabur. So, it´s possible to make a game of corruption without magic, potions, change of bodies, etc. Example: GOOD GIRL GONE BAD. To say that change of bodies, magic, potions, etc. is the premise of corruption games is absurd.
But again: It's easy to write a scene in which the corrupter uses the body of other character to trick the girl and casts a spell on her to control her mind, trick her to drink some kind of aphrodisiac, hypnotices her or something like that. It's difficult to write a scene in which the corrupter charms his victim by using mostly good lines of dialogue. That's why Good Girl Gone Bad (continuing the example) is a way better and more succesful game than this one, even if the art of this one is way better, since the art of GGGB is just to trace real porn photos.