During class, I can't think of anything but masturbating—until my serious teacher offers me special private tutoring over summer break. "If you're too aroused to concentrate, you just need to cum, don't you?" she says, initiating instruction aimed at thoroughly emptying my balls. She begins grinding her big ass against me, face-sits, and teases my nipples while riding me cowgirl-style, deliberately turning me on. Soaked in lotion, she straddles me again and again, building pleasure higher and higher. No matter how many times I cum, it never ends—her tight, relentless pounding, driven by genuine care for her student, delivers the ultimate satisfaction.