Women follow Alpha males more than beta males . Just tell her straight up you want this and need this to happen because unfulfilled fantasies will never go away ! Eventually it needs to happen . Encourage and support her . As far as her maybe wanting it or she might have been secretly desiring bbc ? Who cares ? You want it to happen correct ? That’s all that matters ! All women want amazing sexual experiences so you’re giving her a gift and she would be giving you a gift fulfilling the fantasy ! Go for it dude !