Aya Sazanami's sister has a very strange hobby, which is to redraw the details of the erect "boy", and she has to constantly help to be able to complete her artwork, Aya has to suck and lick the model when she sees that it is no longer erect. to help it return to its best shape. But all of that stimulated the sexual instincts of the two, when the work gradually improved, the two came together to create the most wonderful ones.