All of which is fine except i would never take the rules from a cuck. I would never disrespect her wishes, but she would have to give me the rules and limits.
She/they both want your complete sub. After this happens a few times, your ass is next to be owned by her Bull. A complete acceptance of your marriage to her lover.
No reason not to allow this. She won’t be doing anything there she isn’t doing already. Just more of it.
Before she leaves, have her hand you her birth control