It is possible that she has a big black man fantasy and she told you! You know how much trust it takes to feel comfortable enough to express that to your partner? Think about all your secret desires would she be intimidated by any of them? I think your looking at this all wrong. She doesn’t need more if she did she’d of luff you a long time ago. YOU are in control of the BBC so use it and enjoy giving her the pleasure of her fantasy. Then tell her about one of yours so she can make it happen. Maybe buy her a harness for her BBC so she can peg you with it. Win-win!