One day while watching the news you see a group of scantly clad women calling themselves the sailor senshi fighting a monster girl. "What the hell is that?" You wonder as you get a terrible head ache. You remember being The Archmage, the most powerful mage and artificer of earth. You remember the queen going mad and summoning an eldritch abomination to fight the Silver millennium slutty aliens that were fucking the prince or some such.
"I'll be damned." You say. You need to protect earth from the queen and the senshi. You rack your brain to find a solution but you are lacking materials and an appropriate workshop. You recall some old intel you had on the sailor senshi, about how the poor bitches were bound by powerful geas to enforce their obedience. Regardless of what they once were, this time they are humans born from earth so you won't place misdirected hate on them. Based on your memories, you have crafted some magic collars that will hijack their geas and make them love and obey you instead of fulfilling their duty to some dusty dead alien.
You have also managed to create a temporal stealth device that sadly looks like a tinfoil hat, It should hide you from the ever seeing eyes of Sailor pluto. You just need to collar the senshi... as if it would be that easy.
It was surprisingly easy, You actually managed to collar all the inner senshi. Of course the senshi are now aware of you, and the collars effect is not immediate. Now you must spend time with the senshi while the collars work their magic. You think the best order is sailor moon, sailor mars, sailor mercury, sailor jupiter and sailor venus. Thankfully sailor moon seems friendly and she probably won't attack before the collar kicks in. The outer senshi are a bigger problem but hopefully by that point the inner senshi will help you.
You confront the now collared Usagi and say "Hello sailor moon."
"Oh! it's the pervert of the collar from the other night!" She responds.
"My name is Tanetsukeman." You say lamely. Usagi scowls cutely at you.
"How did you know I was sailor moon?! The transformation magic should have prevented you from knowing!" She says defensively.
You point to the collar you placed on her neck and say "As you are probably aware, the collar in your neck is magical and once fully active it will make you obey all my orders."
Usagi seems to pale a bit. "What are you planning to do with me?"
You say "I remember you... from a past life. When you were the princess of most of the solar system. I am loyal to earth and i will stop you if you have any intentions of conquering earth."
Usagi stands there with a stunned look, finally she says "I don't remember much of my past life. We are not planing to conquering earth we just want to stop Beryl!"
"It doesn't matter! Your loyalties do not lie with earth and you have been unwittingly using your powers in order to revive the silver millennium which is something i won't tolerate." You say as you inspect the geas on usagi, it's powerful and insidious, it is able to fight the full might of the moon, you murmur "I will have to stabilize the collar with tantric magic. Do you know what tantric magic is?"
"It is a type of magic that uses sex to gain power." Usagi says.
You nod "That's correct. I will fuck you to keep you contained with the collar, and you will fight for earth against Beryl and the dark kingdom."
"What?! You want me to have sex with you?" Usagi says blushing and a bit aroused. It seems the collar is working fine.