Wife shy/nervous but fantasizes about me watching her with a stud...

My wife watches videos (we have many) of real people where wife is getting nailed by huge BBC (or 2 or 3) and always says she gets off on it...but when I suggest it she pulls back and gets real shy. How to convince her? Without pressure? I'm sure she really would get into it but she can't seem to take the plunge...

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Has she been in a situtation where she could be 'hit' on without you around??
wife would rather have cock left over than room for more!!!!