During role-playing irl. What could be act of black being our master?

We want to set a meeting. It's not about a clear form of cuckold sex. We are planning only role-play of humiliating us and showing us we are his submissive dogs. Oral sex is only considered. We generally did once and it was about me husband licking his feet and wife licking at the same his ass. Do you have better ideas?? :)