Taking it to the next level

Looking to see if anyone has a suggestion... married 20+ years, good sex life, great relationship... being a perv lol, I want to go to the next level. We have used all kinds of toys, vibrators, dildos, cock extensions... we have watched loads of porn here and on other sites together and while fucking. We have fantasized about adding a third into the bed now for years. We both would like it to be a BBC... for the contrast and size... the thought of it drives us both wild. We have interacted with numerous guys that fit her request (ripped with a huge cock), BUT... she just can't seem to pull the trigger. She says she feels weird and isn't sure if she can do it... is there a solution??? anyone been through a similar situation???