One of the greatest things about stepson getting a boner upon helping mom to shave her twat is that the tattoo is clearly a step up from the amateurish "cutesy" tattoo she may have been dreaming about. Stepson gets a boner upon helping mom to shave her twat and all it takes is one beautiful, clever and well placed tattoo to complete this transformation. A tattoo can be as simple or as complex as one's taste allows but it is a representation, a statement and an announcement all in one. Tattoos are a form of self-expression and for stepson, he knows he has the opportunity to show his softer side and that of his stepmother in ways he never could before..