About to be cucked. Question for the already cucked

My wife and I are in our 40s, solid relationship. We have come to the point where she willingly treats me like a cuck and likes it. Whats missing is the bull, so we are about to find one. And she and I want a really well hung older guy in his 50s 60s to show us the ropes.

My question. I'm 7" with a 5"around cock. We want a 9+ by at least 7" around.

Is his cock going to make a big difference to her? 2" longer and a 2" thicker...doesn't sound like much of a difference. What can I expect?
Thanks for your replies.

Yes, it will make a difference... but good luck finding such an oddity...