A plain-looking female teacher who wears glasses is signaled when she's wearing see-through, large-buttock underwear; this is a signal that you can ejaculate inside her. (Suehiro Jun HMN-359)

Jun, a female teacher, appears simple and earnest, but due to her somewhat timid personality, she has an affair with a fellow physical education teacher. "Jun's ass is so sexy, wear these see-through panties to class!" the illicit lover forces, making her teach a shameful lesson in front of her students. When the affair is exposed, the students exploit her weaknesses and force her into sexual intercourse. "Since you're already having an affair, you can have regular sex with us now, right?" Jun initially resists, but under the overwhelming hardness of a teenage penis, she completely succumbs! Her plump buttocks tremble, and she lets out a lewd scream!