Joe and Nicky have done a lot in the years they have been together, but they haven't tried fisting (or they did and it didn't go well so they abandoned the attempt.) Cue Booker casually letting slip that he has done it, and him giving the boys a hands on lesson. If you want to throw in some plot, set it after Booker's return, and it can be a trust exercise between the three. Bottom Nicky as the recipient, please.