When I was dominating you at your house last time, I just brought her shoes with me. The clip just freaked you out, but you were so horny as well. Since you know that your wife is nothing interesting, this is why you have this secret life as a sub. However, this will make things spicier because you'll ask her to put on her shoes the next time she asks for some sex, and guess what... Watch me make her dirty shoes dirty by rubbing my sweaty feet all over them.