same here. I have not shared her with a BBC yet only White, looking forward to it though. I can say i am addicted to watching her with other guys. I share her there is no Alpha or cuckold scenario. it is hotwife/stag fun. I enjoy watching her in action, letting herself go and being pleasured. I would say its a very selfless act that i let her play except i enjoy it so much. i love hearing her beg for a guy to cum and to her her moan and orgasm as he fills her. there is no doubt it creates a bond.
some of the guys have been vasectomy safe and some fertile. i have noticed she really gets off more when a fertile guy floods her pussy and she will usually hold them inside her longer. instinct i am sure.
also, size isn't everything. she has a 6" guy that makes her feel as good as better as the two 9" guys.
She'll love it more -- and so will you -- when she gets that black dick. No comparison.