Go for it

You know deep down that you have to seduce her in some way, but you will have to try and get to her trigger if the Headmistress's scent really is what will compel her to find you irresistible. You decide to go for it pushing your face underneath her skirt. She gives a gasp of surprise inhaling deeply. She is about to struggle, but you feel her relax and giggle. You can't help but spot a womb tattoo from this position, but its exact nature is hard to determine from the angle, with your face more or less squeezed between her cheeks.

"I didn't know I was dealing with a professional muff diver... Please don't mind me, Muff diver. Kindly acquiesce to the primal inclinations of your fundamental necessities."

She is practically riding your face, grinding back and forth. You can feel her love flowing over your features and she is clearly moaning loudly.

She is definitely about to explode, you are pretty sure that she even moans it out for you. "I am on the brink of experiencing climax." You pull back and she looks at you with desperation. Now is the time to strike. You explain that you want to use the library for some board game nights, and she is about to refuse but you lean in and give her clit a lick.

By the time you are done discussing the terms of your deal, you feel like you have gotten quite the setup in place. You smile, happy to have done such a good job.