need some help converting gf to BBC slut

my gf and i have recently been enjoying a big black dildo and she knows how much it turns me on to see her with it. and of course i can see how much it turns her on. i want to take the next step now. i figured the best way to actually make this happen and get passed the "just a fntasy" stage would be to maybe pick up some interracial porn for us to share. i have never gone to an adult sex shop before so i dont even know what kind of selection they might have. does anyone have any suggestions on specefic titles to pick uo and try? i would prefer the obvious (BBC, pretty little white whore) but with a lot of emphasis on her being a slut for black cock. she fell in love with her sean michales supercock we ordered so maybe it would be fitting to find something with him in it. any help will be much appreciated.