The alluring new female teacher, Miss Shiraishi Miki, reveals her H-cup breasts during a sex education class at an all-boys school, teaching students about the differences between male and female bodies. Highly sensitive and shy, she becomes even more aroused by being watched. With class about to begin, she removes her bra, exposing her heavy, voluptuous breasts as the eager students gather around. Amid giggles saying "Don't be shy," she smoothly jerks off a student, catching his semen in her hand, then spreads her legs in a wide M shape, exposing her pussy. "Even if I don't want to get excited, my juices just flow," she moans, unable to suppress her pleasure. Next is a lesson on pregnancy and practical intercourse demonstration. "Are you sure it's okay to use me, a new teacher? Being looked at so closely..." she stammers, her embarrassment utterly charming. Gently stimulated with fingers on her nipples, clitoris, and vaginal opening, she cries out, "Ah... everyone's watching...◆" overwhelmed by sensation. Her face now melted in ecstasy, she gives a sloppy, drooling blowjob. "You think I'm experienced at titty fucks? That's not..." she protests, though her skill betrays her. Not just anyone can handle an H-cup titty fuck. The students are all getting a great lesson! Her first sex in three weeks begins with missionary—thrusting deep, squelching wetly. "What exactly is 'no'?" she gasps, unable to resist the pleasure. "It's not that it's wrong... I don't want you to stop~" she teases, invitingly asking the students for guidance. "What positions do you usually use?" they ask about her relationship. "With my boyfriend, I'm on top... like this," she says, instinctively grinding back and forth. "You're bigger and harder than my boyfriend—I love it~" she moans, lost in pleasure. Climaxing in cowgirl position, proudly displaying her pussy to the students, then again from behind. "I'm gonna get pregnant! I'm getting married next month!" she screams, climaxing repeatedly in creampie ecstasy. Receiving creampie after creampie, Miss Shiraishi concludes: "Now that's what I call a lesson!"