Are you good enough to be her slave?
Here is what's going to happen. I'm probably going to have to give my boyfriend a blowjob later, and I think it's unfair that I have to do it and not you. If he's OK with having you here, you can do it in the future instead of me. If he's not OK with it, I'll have to set you up a cage in the shed or something, but I'm getting ahead of myself.
You, my little puppet, are going to take that thing out of your ass, and give it a blowjob. Hold it with one hand, and pull on your tiny pecker with your other hand. I want you to taste the shit. Imagine it's mine. Imagine my boyfriend has just finished fucking me, and decided that he wants a blowjob. I'm not going to do it, because that's just gross, but you will.
Think how happy and relieved I would be, having you there to clean my poop off my boyfriends dick. Think about how good it would feel, taking it down so I didn't have to.
Go on. Do it. After about 30 seconds, carry on.