1. Once the castration is done, the Yukkuri will wake up a little confused. Keep the Yukkuri from rubbing the castrated area for a few days. 2. The castrated Yukkuri will be able to become pregnant exclusively by rubbing (rub-rub) and all the children will develop on stalk. 3. Another purpose of removing the PeniMamu, besides reducing sex drive, is making the Yukkuri unable to have a mammalian pregnancy, which is induced by Peni Peni penetration. During mammalian pregnancy, the children develop inside the Mamu Mamu, which forms a bag that protects them from being digested by mother's filling. When PeniMamu is removed, the children embryons will float in the area where Mamu Mamu was and they will be digested as food. So a castrated Yukkuri can be raped by Alices without worrying about the offspring.