Everyone feels the hierarchy among students at least once in their school life. Nowadays it is called the school caste system, and once the hierarchy is set it is almost impossible to overturn! I am at the very bottom, with a nerdy appearance and the only redeeming quality I have is my libido. Despite my appearance and libido, it was only useful for masturbation, but Rima, who is at the top of the caste, chose me as her sex friend! I quickly turn into Rima's personal, powerful dildo, instead of a handsome boyfriend with a weak libido! A windfall for a nerdy man's sexual youth!