The survivor, who hails from Kasaragod, was sexually assaulted inside a car on Thursday night.
The alleged incident had taken place in July but the victim approached the police on Tuesday only after the matter was highlighted by the Delhi Commission for Women.
The incident came to light on Thursday night when a team in Mau district of Uttar Pradesh rescued the girl from the captivity of a woman and busted the case.
The boy has been admitted to a hospital in very critical condition.
The incident took place in the Madhav Tanda area of the district on September 7, the police said. However, it came to light when a video, wherein the victim is narrating her ordeal, went viral on Satu
Three days after an ASHA was gangraped, Paradip model police on Monday arrested two persons in connection with the incident.
While the 13-year-old rape survivor has been sent to a destitute home for children, the accused SHO, who stands suspended, is on the run.
The woman was heading to Nagayalanka in Krishna district along with her husband and their three children when she was reportedly violated by the trio.