ARM-423 The teacher pretending to be serious

The teacher always wears a short skirt, and while she pretends to be serious and doesn't seem to understand, the hem of her tight miniskirt has been rolled up. I wonder if she's actually showing it on purpose? But... if she shows me her panties right in front of me like that, I can't concentrate on studying... She starts off by showing me her panties in a defenseless way, and gradually becomes bolder... and in the end, she makes my dick cum erotically and gently!