Linus had a great workout going today. He really felt pumped up to lift hard today. He’d be seeing Sean again today, so he wanted to be in his best condition to compete with his muscled boyfriend. Linus’s own progress had continued steadily since his musk driven growth. Tank tops no longer covered his whole torso. Workout pants were getting tighter because of his growing legs. Even his calves were strongly defined, having a noticeable bulge even while relaxed.
But even with all that, today was damn good. He increased his max weight on every exercise. He could somehow bench 200 pounds, almost twice his body weight. He thought he could hear the seams tearing on his pants as his thighs bulged during his squats. But now was the fun part. The most dude bro exercise ever: Bicep curls. Linus had been at the gym long enough to know that every guy wanted to bicep curl, to see the their arm jump up, to feel it course with blood, and feel the pleasant tingle of a pumped up arm for the rest of the day. Linus was no different; he just didn’t want to admit it. Grabbing two 40-pound dumbbells, he sat on a bench far away from other lifters. A newfound body and boyfriend made him happy, but you can’t just fix shy.
Regardless, Linus started lifting. The first two reps challenged him, but the more he did, the easier they became. He could feel his biceps actively pushing harder, lifting them faster and faster. He felt an energy welling up in him, like the pump after a good lift. But this pump kept growing. It started in his arms that were now buzzing. He could felt like he could life these for 20 more reps. However the vibrations spread to his chest and shoulders. Linus started breathing heavily, this new power overtaking him. He felt his tank top push out further. The pumped feeling continued down through his six pack. It felt like each ab was being given a charlie horse, squeezing tighter and tighter. Linus continued focusing on the curls while enjoying the new feeling.
Unfortunately, a new, stronger, more arousing feeling was taking over. The buzzing now centered on Linus’s crotch. The pumping went straight for Linus’s 5-inch softie, chubbing it up. It quickly got to a semi, straining against his shorts. The pumps were getting stronger and stronger though, forcing his cock bigger and bigger. Eventually his shorts couldn’t handle the amount of cock anymore and Linus’s foot long cock poked down through his left leg. Linus was helpless. He was still lifting the weights and had to deal with a steel hard erection out in public. It pulsed and throbbed hard, a bead of pre even spurting down onto the floor. Linus even swore he saw it jump up another inch in length. With a lean hot twink like himself now lifting weights with over a foot of cock jutting from his shorts, Linus started attracting onlookers. A couple guys, all with visible bulges themselves, gathered around Linus. Just a few more reps, Linus thought. Just one more and I’ll be able to run to the locker room. With one last hard push, Linus cranked out his 30th rep of curls, simultaneously shooting a thick rope of cum onto the mirror in front of him. Utterly confused but even hornier, Linus wondered what the hell was going on. Then he smelled a familiar scent, a musky one that reminded him of his boyfriend. But Sean was nowhere in sight as steam started escaping Linus’s hot tense body.
“Time to call up the ‘boyf’ I guess,” Sean muttered, rushing to the locker room to fully relieve himself.
After a late night drinking, Luka wakes up with a strange bite mark. He doesn’t think much of it until the moon comes out to awaken the beastly urges dwelling inside of him.