Evan looked at the remaining drop in the vial. He had drank more than Dylan but had still ended up smaller than his younger friend. Evan wanted to be bigger again. Dylan's genetics had made him so big and perfect. Evan needed some of Dylan's DNA to mix with the final drop of the potion. And maybe that would give him the last growth spurt he needed to outgrow Dylan.
Evan held the small bottle tight in his massive hand and started to head back downstairs. Dylan was still sitting in his chair, hard as a rock. Sam and Austin were both fully naked now, and they had grown even more in Evan's time upstairs. Sam's beard was easily just as impressive as Evan's and he was getting more and more muscular by the second. Evan couldn't be sure, but he thought Austin looked taller than him, and his dick may have been bigger, but he was still less muscular and hairy. Evan would have to move quickly or they too would outgrow him.
The doorbell rang again. Dylan ordered Sam to open the door. Two more guys from their school were at the door. Trevor and Grant were shocked that the door was answered by a massive, naked man, but that shock went away when Dylan's pheromones hit them. Hypnotized, they entered the house and dropped to their knees.
Dylan was about to cum again and that would be Evan's chance to get some of his DNA.
"Get over here!" Dylan barked at Austin. Austin moved quickly to serve his Alpha. Austin put his mouth over Dylan's godly cock and began to work. He was so massive that Austin couldn't even come close to fitting it all in. Trevor and Grant were servicing Sam as they both grew.
Watching two new Beta subjects grow made Dylan cum. He completely filled Austin's mouth with his seed. Austin tried to swallow the massive amount, but sputtered and let some drip out of his mouth and onto the floor.
Dylan was too distracted by his orgasm to notice what Evan was doing. Evan quickly scooped some of the cum off the floor into the vial, careful to not spill the last drop in the process. He swirled the new mixture around in the vial before drinking his new mix. It tasted sweeter and more powerful this time, and Evan made sure to lick the vial clean. There would be no more for anybody else.
This time, the changes began almost instantly. Evan's height increased more than a foot in a matter of seconds making him almost 8 feet tall, a full foot taller than Dylan. Next came the muscle. Evan was already ripped, but anywhere on his body where more muscle could be packed on, it did. His legs filled out even more, his feet grew, his abs and pecs became bigger and more defined. His biceps inflated. As soon as the muscle ended, more hair began to cover his body. His feet, legs, abs, and pecs all become even harrier. His beard grew in more full and darker. He felt a change in his throat and reached up to feel a much more prominent Adam's apple.
Finally his dick grew even more. The feeling of it lengthening was orgasmic before it settled at about a foot and a half in length, rock hard. The girth was unmatched and the hair surrounding the base was insane. The tiny drop of potion hadn't done much. It was Evan's own DNA fusing with Dylan's far superior genetics, combined with the potion that made him so manly. Evan now emitted a pheromone far more powerful than Dylan's.
By this point the other 5 men had stopped what they were doing to gawk at the newest Alpha among them. Dylan was the most surprised. He stood up to try to control Evan, but realized that would no longer be possible when he craned his neck up to look at the manliest face he'd ever seen. Evan made Dylan look like a child despite his own hair and size.
"On your knees," Evan bellowed in a new deep voice, that shook the glass of the windows. Sam, Austin, Trevor, and Grant all dropped to their knees, frothing at the mouth for his dick. Dylan tried for a moment to resist his new Alpha's command. But it was no use and after just a second or too, Dylan was on his knees, ready to serve the god in front of him.