Start with a bbc dildo, just hide it and take it under the covers when you go down on her and go to town. I did the and she loved it, I showed her the dildo a month later. We haven’t had cuck talk yet but I’m hoping someday soon she will get fucked like this by a true bbc.
About eight years ago, I had a Nigerian bull who lived out his fetish by fucking me in front of other viewers on live chat with the camera running. It was his friends who still lived in his home country, three of his siblings, and even his father whom he let watch him fuck. It was bizarre for me, but in the end I let it happen because these people were far away and I would never meet them. I enjoyed the thrill of being watched and that his father treated me verbally like a slut and at the same time like a daughter-in-law. If he ever met me, he would fuck me too. I gave him that promise. I enjoyed it very much every time, but it was too dangerous for me with other people.