everyone experiences the hierarchy among students in school life. recently, it's called school caste, and once the superior-inferior relationship is set, it's almost impossible to reverse it! i, who is at the very bottom, have a chubby appearance and my only merit is my sexual desire. even with my appearance and sexual desire, the only thing i could do was masturbate. but, i was chosen as a fuck buddy by lima, who is at the top of the caste! replacing her boyfriend with a weak libido, i quickly turned into a raging live dildo dedicated to lima! a sudden sex spring for a gloomy guy!