Chad spent the rest of the day inhaling Matt's musk, and only when they were at Matt's apartment did he took Chad out and set him on his bed.
From his point of view, Chad saw Matt took out his dick, enormous to him, and start rubbing it. In no time it was hard and leaking precum, which Matt sampled with his finger and deposited on Chad. That seemed to initiate the transformation, because the next moment Chad was sitting on the bed, looking at the huge dick dangling in front of him.
He started to salivate. He should have been disgusted, he had use as a cup for days, tattooed against his will, and now facing Matt's huge, smelly dick, and yet he wanted to take it in his mouth, take more of it. He realized that he hadn't just gotten used to Matt's musk and taste, he had started to like it, crave it even.
"Welcome back slut. You must be sufficiently intoxicated by now." Started Matt, swinging his dick in front of Chad's face, back and forth, back and forth.
"I have a small proposition for you. As you maybe understood, you change back when I get cum on you, and reverse to your cup shape when you yourself cum. So you could try to run if you wanted, but unless you never cum again sooner or later you'll find yourself as a cup again, and probably be thrown in the trash."
Chad was not happy to hear that, but he said nothing. He couldn't quite break the spell of the musk and sight of Matt's dick.
"So here's my proposition. You become my bitch, fully. You come live here and take care of me. I'll train you for it. When I have practice, I'll let you cum and you'll change into my cup. You'll also spend your nights as my cup, close to my dick. But the rest of the time, I'll let you be human. You'll have your life, or part of it anyway, back this way."
This was, Chad knew, a bad deal. He would either be in human form serving Matt, or stuck as a cup smelling his musk. Yet not only he knew he couldn't say no, he found the he didn't really want to. The idea of being close to Matt, of being his bitch, made him hard. After so many hours smelling his musk, it had truly penetrated his brain.
"Fine Matt, I accept."
Matt tsk.
"Call me master from now on."
"Fine, Master. I accept."
Chad said this in a resentful tone but he found himself excited saying it.
"Good. Now start sucking my dick."