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Barrett started moving immediately, pulling about half his monster cock out before slamming forward again, pushing the whole shaft into a helplessly horny Adrian. It started slowly to give Adrian a chance to adjust. But the big guy slowly picked up the pace as Adrian relaxed and clearly loosened around the thick shaft.

They felt the mattress dipping beneath the powerful thrusts, adding another layer of sensation to the already incredible experience. Adrian could see the muscles in Barrett’s upper body flexing and relaxing in rhythm with the pounding, making each movement look beautiful. His immense tits bounced heavily with each motion, so hard that the milk inside them sloshed audibly amid the moans and groans.

Barrett gradually started moving faster and harder, and Adrian’s breathing changed with it. Some groans were low and strained, while others came out louder when Barrett pounded with harder and more intensity. After a while, Adrian stopped wasting energy trying to suppress the sounds coming out of his mouth, fully surrendering to the moment.

Then, his hands moved from Barrett’s shoulders to the immense tits, pressing his hands against them. “Fuck, you’re big,” Adrian said between moans.

Barrett was pleased by the comment. “You’re holding onto me like I’m gonna float away.”

“You’re the size of a truck,” Adrian added, instinctively wrapping his legs around Barrett’s waist as the pounding continued without breaks.

“I must admit,” Barrett whispered, leaning in to press his tits more firmly into Adrian’s touch as his hips snapped forward. “You’re adapting faster than I expected.”

Adrian smirked. “Then stop treating me like I’m made of glass.”

Barrett chuckled. “You’re starting to sound greedy again.”

“Maybe I am,” Adrian said, grinning playfully.

Barrett adjusted his position and began pounding faster. Adrian felt the difference immediately, and a loud moan escaped his lips as his legs tightened around Barrett’s waist.

Barrett groaned as well. His breathing turned heavier, clearly altered by the intensity of the moment. His jaw tightened, his enormous chest pushed harder, and deep groans came out of his mouth between breaths.

Adrian’s whole body felt hot. At first he assumed it was exertion because they had been moving for a while; every muscle in Adrian seemed to be working, and Barrett radiated enough heat to make the bed feel warmer. But he noticed that the sensation was different. It wasn’t only on his skin anymore. A deep heat had started inside him and was spreading slowly through his torso. Adrian frowned, concentrating on the strange sensation.

Barrett noticed. “What?”

“I don’t know,” Adrian said, breathlessly.

Barrett smirked. “I’m leaking into you,” he said slowly, still pounding hard. “What you feel is my precum entering, and probably your body reacting to it.”

Adrian’s eyes widened as the heat spread farther. “There’s so much.”

“Buckle up,” Barrett said. “We’re reaching the real deal.”

The pounding intensified, so much that Adrian closed his eyes and let pleasure wash over his body. He could feel something stirring inside him, spreading a tingling sensation across his body. His mind couldn’t process all the things happening at once, but it was better than he ever expected. And the best part was watching Barrett’s massive body and handsome face right above him, taking over his entire view.

“Ready?” Barrett’s expression tightened. “Here it comes.”

Adrian barely had time to understand what Barrett meant before the big man’s whole body tensed above him. Barrett let out a deep groan, and his arms locked beside Adrian as the enormous muscles across his chest, shoulders, and stomach tightened.

Adrian immediately felt a massive rush of heat flowing into him. “Oh, fuck!” He cried out, arching his back in pure pleasure as Barrett filled him up with fire-hot cum.

The sensation was overwhelming. It felt like everything his body had been experiencing suddenly peaked and jumped to new levels. Adrian could feel the fullness building inside him, and the amount of cum made his breathing turn into broken gasps.

Barrett groaned loudly above him, and the cum just kept coming. His body continued tensing, and each pulse sent another intense burst through Adrian. His ball felt heavier than ever, tightening and relaxing to pump more and more cum out.

“Fuck,” Adrian moaned. “How much do you fucking have?”

Barrett managed a breathless laugh between groans. “I am the Source.”

Adrian wanted to laugh, but the sensations were too intense. Even his abdomen started to round and push outward with all the thick cum entering him. But it was only the preparation for what was about to come. 

The heat that had started in his core suddenly exploded outward. The pressure in his muscles became much stronger. His arms thickened, his chest swelled visibly, and his shoulders spread a few inches across the mattress.

Adrian cried out. “The fuck!”

Barrett looked down, smirking proudly. “Calm down. You’re growing.”

The bed gave a faint creak as Adrian’s weight increased. His thighs thickened, spreading farther across the mattress. His ass grew so much heavier beneath him that Adrian could feel the bed sink more deeply under his hips. His back continued widening until he seemed to occupy an entirely different amount of space. He tried lifting one arm, but the movement felt strangely slow because the arm itself had become heavier.

Adrian wanted to focus on the changes, but Barrett was still pounding into him, and the cock was still shooting cum deep inside. Still, he could feel his biceps bulging massively when he bent his elbow, far larger than anything he had ever built in the gym. The muscle felt unreal compared with the arm he remembered having less than a minute earlier.

Barrett was still breathing hard above him, loving the sensation of such an intense climax, but he was no longer paying attention to himself. He was staring at Adrian. For once, Barrett was the one who couldn’t stop looking.

Adrian’s pecs pushed outward again. The muscles across his sides and back continued packing on mass as though his body had no sense of slowing or stopping. He groaned and let his head fall back as Barrett stopped the pounding but kept cumming for a little longer. By the time the flow finally stopped, Adrian’s belly was taut and firm as his body still started to process the thick cum load to turn it into muscle mass.

The big guy moved back slightly, giving Adrian more room to expand. He slowly pulled his cock out, making Adrian groan when the head popped out with a loud pop. The moment some of Barrett’s weight moved away, Adrian noticed how much he had grown already.

He tried sitting up, but it took more effort than expected. His abs tightened, but even with all that new strength, Adrian’s brain wasn’t used to moving so much mass. He pushed himself halfway upright and had to press one hand against the mattress for balance.

“Your balance is gonna be weird for a minute,” Barrett said, reaching forward to help.

“A minute?” Adrian asked, still struggling to move.

Barrett smiled. “Maybe longer.”

Adrian looked down at himself. The athletic 6’0” tall guy who had walked into Borst that morning looked like an earlier draft of the man sitting on Barrett’s bed. His chest was dramatically thicker, his shoulders much wider, his arms were dense and packed with muscle, his torso looked powerful, and his thighs were enormous compared with before.

Even sitting still, he could feel his new weight pressing into the mattress. He lifted one hand and squeezed his opposite biceps, sinking his fingers into the hard muscle. He flexed experimentally, watching his biceps swell upward.

“Damn it,” Adrian whispered, and Barrett laughed. “Don’t laugh.”

“I’m not laughing at you,” Barrett said. “I’m enjoying the face you’re making.”

Adrian flexed again, unable to stop himself. Then his chest tightened, and his pecs swelled some more. “Am I still growing?”

Barrett leaned closer, patting Adrian’s cum-filled belly. “You will be growing for a while. At least until your body processes all my cum.”

Adrian saw his shoulders and thighs expanding before his eyes, and the mattress dipped further beneath him. He sat there silently for several seconds, testing his body as the heat still spread through it. Then, he looked lower and finally noticed that his cock was longer and thicker, and his balls were heavier between his thighs, resting heavily on the mattress.

“Fuck, this is weird,” he whispered, reaching lower to cup his balls.

Barrett nodded. “Your brain still has to process everything.”

Adrian looked over at him. “How much do you think I weigh now?”

Barrett studied him from head to toe. “Close to 300 pounds, I’d say.”

“What?” Adrian looked down at himself in disbelief. “I was around 180 pounds when I came in this morning.” He ran both hands over his chest, feeling the thick muscle beneath his fingers. Then his hands moved over his arms, abdomen, and thighs, as if he needed physical proof that all of it was attached to him.

A smile appeared on his face, and he pushed himself upright more carefully this time, still adjusting to how his new weight changed every movement. He was exhausted, sweaty, and breathing harder than he wanted to admit, but the excitement won the battle.

Adrian looked at Barrett. “How do I look?” He asked.

Barrett looked at Adrian up and down. “You look incredible,” he said, making Adrian smile. “Seriously. I didn’t grow anywhere near this much on my first time.”

Adrian’s eyebrows rose. “Really?”

“Yeap. I was about 185 pounds before my first dose and gained about 80 pounds on my first day,” Barrett explained calmly, getting a little closer to caress Adrian’s new muscles.

“So, this is only the first dose?” Adrian asked. “Am I gonna get even bigger?”

“Now you’re getting it.” Barrett grinned. “You’ve got the rest of the semester before you take over,” he said. “At this rate, we’ll have to enlarge a few doors.”

Adrian laughed, but the comment hit the part of him that Barrett probably knew it would. The competitive spark in his eyes came back immediately. His body was still hot from the first transformation, and even though the hardest part of the growth had finally slowed down, there was still cum in storage to get processed.

“Fuck,” Adrian said, flexing one leg slightly. “I still can’t get used to this.”

Barrett chuckled. “You’ve had the body for about two minutes.”

“Fair,” Adrian replied, lying back in bed and feeling the new weight in his hips and thighs as he spread them again. “Then teach me, master,” he said, using the word with a teasing respect he might have used for a mentor who had just proven he knew exactly what he was doing. “Give me my second lesson.”

Barrett stared at him for a second. “Are you serious?”

Adrian nodded.

“Dude, you just gained over 100 pounds,” Barrett said, moving closer to Adrian.

“I know.” Adrian rolled his eyes. “Are you teaching me or not?”

Barrett leaned closer as his cock got hard again. “Bossy.”

Adrian spread his legs a little wider. “Come on,” he said.

“No hesitation this time?” Barrett asked, smirking.

Adrian shook his head. “I already know it fits.”

Barrett moved closer and carefully positioned his cock at Adrian’s hole entrance. He pushed forward, feeling how Adrian’s body tensed at the contact but spread nicely around the massive cock, almost eager to get more of it inside.

Adrian shifted slightly, adjusting his hips, and groaned again when the movement made his hole clench around Barrett’s cock. The bed dipped even more beneath their combined weight as he pushed deeper, and Adrian felt how different the second round was. His larger body gave him more strength and stability, but it also meant every movement involved more muscle, more weight, and more pressure. His thick legs tensed around Barrett, his back pressed into the mattress, and his arms held him more firmly onto those massive shoulders.

“Come on! Fill me up!” A low moan slipped from Adrian’s throat. “If you want me to be the Source, you better turn me into the biggest one this place has seen.”

“Greedy,” Barrett said, going balls deep and moving back already. “Exactly what Borst needs,” he said, slamming forward with such force that Adrien cried out, his eyes rolled in his head, and his back arched in pure bliss.

THE END

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PS: AI Generated image only meant to illustrate the scene.

Adrian after his first dose: