In a lot of naruto Fanfiction authors talk about  naruto moulding girls pussy so only his cock fits.   The challenge is for some to write a story were chakra is used to literally do this.   other effects of this could be Hinatas early development in canon the Hyuga clan see hinata as failure only fit to pop out children so when they use chakra on her when training her they slowly mould her body to make what they think true. With hinata latching on to naruto being the only thi