Cuckold Husband Rule 3: If I command it, you must suck a cock for me.
If that is my desire, you must obey.
If I bring a friend over to fuck, you will suck his cock for me. You will get him hard for my pussy.
I can see the thought of this is disconcerting, but deep down, I know that you will love sucking cock for me. Because I will love this. I promise if you obey that a lot of times I will suck cock with you. If we share a cock to orgasm, after the cock explodes, you must cum share with me--you must swap the cum back and forth with me.
Isn't the thought of this making you hard again?