Ginka's right, considering how sex-crazed all the characters are, the idea of a potion that lets you swap bodies and have sex with yourself in the body of your partner is exactly the kind of kooky sex toy you'd expect a magic user to make use of to spice up the sex life.
That barrier you made me set up must have been a ploy to prevent Seren from intervening!And you mixed that potion with my drink... You schemed this, didn't you Mifi!Dammit. Mifi made master put up a barrier!I mean, why am I even worried about this...?Whatever! I'm gonna blast a hole through the barrier!Dominion Blaze (weak)!!!Attack<- ->ReceiveAh.Kukuku...JyuYou want to ask a big favor from me? You want to discuss something?Dehehe♥kyaIf that's the case, I'll give this to you for free. I'm sure you won't abuse it.boMind exchange? Are you planning a prank on master?Yeah?Master, run away~! Super run away!It burnt ultra deliciously♪Reference to the Japanese version of Monster Hunter's after cooking dialogue, saying "It cooked deliciously."When you use this, drink this alternatingly with your target.Why haven't you taught us about such an interesting potion?Why are you asking this now?Came to stop her.You're beating around the bush. What do you want?You want a magic potion?Do you have a potion that exchanges a person's mind with another person?It's too late now. It really reads "After Carnival" in English.> 後の祭り> It's too late now.You are a good master, but it's not good of you to rush...!Mifi went puffing home, saying she was going to use a mind exchange potion to rape herself in master-chan's body.Whoaaaa! Mistress. I mean my body's burnt into crisp meat~!?Ah.The magic's effect expired during the uproar.Oh shit.heeeeOkay, I'll say it frankly.I gave her something bad!Since you are ...um... a wizard, can you make magical potions?Umm.. Seren, you're a wizard... right?Great Sorcery