Feminized Big Brother

School president of Hakuhou Academy falls for a trick of forced feminization.
Learned that his sister was kidnapped by rogues, Yuu Ayasaki went to the specified meeting place. There he was asked to become a woman to save his sister. For the sake of his beloved sister, he accepted the condition...
When finally he met his sister again, he has become a nymphomaniac woman with a painted face. He is brought to Ijuin's Laboratory and further operations of body modification are performed such as castration, breast augmentation and penis deformation. Yuu was being turned into a very pervert naughty woman...
milda7 presents this mighty work containing 140 cuts in 104 pages.