He looked down and saw what seemed to be the largest bulge in his shorts. He lpoked up at Katie who just smiled and said
"What Shane aren't you glad to see me?" But before he could answer he felt all the blood rush to his groin and he winced over in pain.
"Oh I'm sorry baby I didn't think that those shorts would hold together, I'll give you some new ones when we get home."
And just as she finished talking Shane felt his dick get smaller.
"That should be more manageable for you right?"
At that point he knew that she had complete control over him. Hopefully she would give him an opportunity to take the machine back...