Joe could see his 'Regular Joe' belly was shrinking.
He stared, jaw hanging, as It shrunk smaller and smaller and smaller and smaller and smaller and smaller and smaller still. Soon, his belly was nice and slim, and really thin.
His shirt and pants looked slightly oversized, but aside from that, he was quite puzzled. He shook his head. Maybe he had lost weight, and been so wrapped up in work and his personal life that he hadn't noticed.
"Look at me now!" Joe said, gobsmacked, "I'm thin! I'm thin! I'm thin!" He jiggled around excitedly, and his pants slipped a little.
He looked down his pants and gaped.
"Well, I'll be damned!" He exclaimed. "I can see my dick!"
He started jiggling wildly, in excitement that he had lost weight.