I'll bet it's not a question you ever thought you'd have to answer. I'll bet you never considered the idea that she might want you to take another man's cock for her. I'll bet, even in your dirtiest fantasies, you didn't think that your sweet, beautiful wife would want you to get on your hands and knees so you could get fucked by her bull.
She's asking the question, though. She wants to know if you'd be a good boy for her. She wants to know if you'd give up your ass for her pleasure, if you'd submit to such a significant degree of humiliation. So what's your answer?
You think you should say no. Of course you do. What straight man wouldn't instinctively say no to the idea of getting fucked? What straight man wouldn't try and cling to some shred of dignity?
But you don't want to say no. You know you don't. You want to say yes. You want to prove that you're a good boy for your wife, that you're a good cuckold. You want to prove that you're willing to do anything to make her happy. You want to prove that her happiness, her pleasure, comes before yours. You want to prove that you're everything she wants you to be.
Still, you feel nervous at the idea of it. You're not sure what your wife will think of you if you take it up the ass for her. You're not sure what she'll think of you after she's seen you be mounted and fucked by her bull. You're not sure how you'll feel about yourself after you've given your ass to another man, after you've felt him pumping you hard and fast from behind, after you've felt him dump his load deep inside you.
Will you feel humiliated? Will you feel like less of a man? Will you feel like a cum dumpster? Will you feel like your wife just turned you into a faggot?
You'll feel all of those things, cuckold. You'll feel each and every one of them, and it will turn you on. She'll be there to watch. She'll be right in front of you. She'll stare into your eyes as you feel the head of his cock push inside you, taking your anal virginity and what remains of your manhood. Her eyes will light up as her bull truly puts her cuckold husband in his place. You'll see the pleasure on her face, the deep sense of lust. She'll get off on your humiliation just like you will.
So you'll say yes. Of course you will. You'll do what your wife desires. You'll do whatever it takes to make her happy, because that's what a good cuckold does. You'll be a good boy. You'll get on your hands and knees. You'll suck his cock beforehand to get him hard if that's what she wants. You'll beg him to fuck your ass, to take your anal virginity, to humiliate you by flooding your ass with his cum. You'll do anything and everything she wants, because that's your purpose.
So tell her. Tell her you'll be a good boy. Tell her you'll take it up the ass for her.