After.Service.Gangbang.Addicts

You have transferred to the same school as your younger step sister, Sayo.
But, Sayo has fallen victim to a dastardly trap set by the schools Queen Bee Elena and is now a raving sex addict. Will you attempt to save Sayo? Or perhaps lend a helping hand in her descent into debauchery.
A secret after school stage of sex, service and gangbangery.