Tony was waiting for Brenden wearing just shorts. Tony knew that Brenden liked his hard, hairy chest so he tried to keep it on display. Brenden noticed right away how much smaller Tony seemed.
Tony noticed it too. Instead of looking down slightly at his younger friend, Tony found himself looking up a few inches at a buffed stud. "What happened to you?" he asked as they went inside.
"Dad mixed something up," Brenden answered, feeling his size decrease a little. He wanted to impress Tony before everything wore off so as soon as they were in the door, he started stripping. "I thought you would like it, so I came right over."
Tony came over to Brenden and started rubbing his hands along the big biceps. "You thought right," Tony said. They kissed as Brenden felt his enhancement gradually ebbing away. Tony was six feet to Brenden's usual 5' 10", and although Brenden had already lost two of his new inches, he had made the desired impression on Tony. Soon, Tony's hands found their way between Brenden's legs. "Any changes here?"
"None that I noticed," Brenden said, "but why don't you take a closer look?" In no time, Tony was sucking Brenden, strong hands feeling Brenden's smooth chest. Brenden leaned against a wall for support as Tony grew in front of him. Six feet came and went, and Brenden was closing in on his natural size again as Tony took his mouth off Brenden's dick to work on his balls.
"Hey," Tony said. "I think it is wearing off." Tony stood up and saw that things were back in their proper order. Still pumping Brenden's cock with one hand, Tony leaned over and said, "I'll still like you even if you are smaller than me," before giving Brenden a long kiss and taking out his own big hard dick, bigger than Brenden's.
Brenden put his hands on Tony's heat, and felt it surge in his grasp. At first it seemed like Tony just gearing up for some mutual stroking, but as Brenden kept watching, Tony's dick kept growing. Brenden looked up and saw that he had passed right by 5' 10" on his way down. It was scary, but just as it had been a thrill to have the muscles, it was a thrill to watch Tony seeming to swell up.
Tony's eyes had been closed, but he opened them and saw that Brenden was still dwindling. "Hey," Tony said, "You don't have to be so literal about it." Brenden was less than 5' 8" as he felt Tony's hands growing around his dick. He never would have thought that it felt this good to have his boner shrink. Tony was slowing down, getting more concerned as Brenden contracted.
This of course was just a greater tease to Brenden. Down to 5' 6" now, he did his best to focus on Tony's growing sex. As his hands shrunk, the dick they were holding got fatter and heavier. The lip under Tony's cockhead was widening and his sac was getting fuller.
Tony had slowed down now until he was just barely stroking Brenden. His 'little' friend had just gotten littler, and he wasn't sure how he felt about that. Brenden did his best to keep Tony's mind on other things, but there was one last big push as his body shrank to 5' 4". Feeling Tony's big hands brushing against his reducing cock was just too much at last, and Brenden started cumming.
Tony sped up his stroking as enthusiastically as he could while Brenden unloaded. Brenden was now about 10% smaller than usual. That seemed to be the extent of it, as Brenden's spasms gradually wound down.