Tim took the top part of Saul's big rod into his mouth and started sucking. He had never been able to take Saul in all the way before, so he started with that as his first goal. He tickled Saul's big balls and then after a few seconds of focusing on Saul's end, he plunged down on Saul's rod, imagining being able to get almost all of it in his mouth. As he descending, gulping, he felt Saul receed gently, his erection becoming narrower as well as shorter.
Saul groaned in reply, and at first Tim thought Saul might have been uncomfortable somehow, but then his partner "Mmmmm-ed" in satisfaction as Tim worshipped the hard dick in his mouth. Tim ran his tongue all around Saul's head, feeling its reduced circumference from every angle.
After a minute, Tim decided that he would be satisfied when he could bury his nose in Saul's hair, having completely deep-throated his man. Slower this time, Tim bobbed his way down. With each stroke, he shrank Saul's penis a little more. Each time, Saul let out little noises of pleasure, "ahhh", and "what ever you're doing, keep it up!" Finally, Tim's face was pushing against Saul's hip bone, Saul's entire prick -- all four or five inches of it -- swirling in Tim's mouth.
It didn't take long in that position for Saul to wind up for his orgasm. Tim grabbed Saul's balls as he felt them tightening up. They were beautiful pieces of work, and Tim realized that he hadn't shaved a millimeter off either one.
Finally, it was time. Saul started to breathe heavily as his dick began to twitch. Tim kicked things off with a little more shrinking on Saul's dick, knocking off half an inch. "Oh, fuck yes!" came Saul's reply as he began to spray the inside of Tim's mouth. With each squirt, Tim squeezed Saul's balls, shrinking them further, and Saul gasped a pleased reply.
After a long while, the cum stopped coming, and Saul sighed. Tim gave his little prick one more shrink -- just for good measure -- before letting go of it with his mouth, and Saul's whole body shivered happily. Tim stood up to look into Saul's still-swimming eyes. "I don't know what you did to me," Saul said slowly, "but that was fucking unbelievable."