Some training.

You wake up next morning just as Adam comes through the door. Waiting patiently, he serves each pup their breakfast. When he gets to you though you’re brought into the office once again to suck his cock.

Once he finishes inside your mouth and you eat your other breakfast he opens a drawer, pulling out a 6 inch silicone dildo with a suction cup on the base. He sticks it on a full length mirror that he has on the wall of the office right at eye level for you when you’re on your hands and knees.

“Practice on that. You’ve got a good mouth but you also have a lot to learn. Don’t stop until I say you can. Understand?”

You nod yes.

“Good, now get sucking. I want you to be able to deep throat it by lunch.”

You start immediately sucking on it. At first you can’t get much further than the head but as you go back and forth on it your throat relaxes and you’re able to get deeper and deeper. If your gagging noises bothered your master, he didn’t say anything about it. The repetition of it starts to wear on you, and eventually you fall into a trance-like state focused only on sucking the cock like a good pet should. You enjoyed looking into your own glassy eyes and blank expression in the mirror. A few times you even went down so far that you kissed your reflection.

You hoped you’d get to try this on real people as well. It didn’t even matter whose cock it would be, so long as you got the chance to practice more and show off your skills. Your jaw and core start to get tired and a few times you stop for a second to catch your breath, but knowing your masters order you kept going past the point of exhaustion.

You’re not sure how many hours later it is when Adam pulls your collar to get you off of the rubber cock. By then you saw the saliva running down the mirror from where you had been gagging on the dildo.

“Good job pet! Now show me what you learned and I’ll let you rest for the remainder of the day. I might even let you cum for being good!”