More days passed before Marcus could notice a change in Kaitlin's behaviour.
The first time, it happened in the local gym.
Marcus spent so much time there that had become his second home. Partially because he loved growing more and more buffer... but the main reason was Kaitlin's secret kink: Sweat bumped muscles. Every time those two visited the gym, they ended up fucking in the showers. With such motivation, the pair went there as much as they could.
But one day, Kaitlin disappeared in the middle of Marcus' weight training. She said she wanted to check a new machines and never returned.
After an hour alone hitting weights, Marcus decided to look for her.
She found her in another room, talking in a lively way to Li, who was sitting on a benchpress too short for him. His sportswear started looking a bit too short on him, showing a bit of his fit midriff. Marc also noticed his long arms and legs were more thick, less "noodle arms", than usual.
"Babe, where were you?" Marcus hugged his lady from behind, starling her for a moment before returning to her lovely self.
"I found your basketball buddy fighting against a machine half of his size and losing. I felt sorry for him and help him find tools more suited for someone of his height... I gave him some tips, and forgot about the time."
"Yes, well, now he's oriented, maybe we could focus to my special training."
"Mmm... okay."
The pair had a session of "special training" in the showers. It felt amazing for Marcus, as always, but this time he noticed she seemed distracted.
The three coincided a few times more, first only in the gym, later in their school. With growing frequency, Marcus found Kaitlin on his side. That started pissing him off.
"Oh, does the macho man feel jealous? Threatened by a big puppy?" Kaitlin laughed at his envy, trying to downplay how much time she spent with the other boy.
"I only said it's strange you didn't take me to the gym yesterday. You always do it."
"You don't have to spend time training a lanky beanpole when you have an almost 7ft tall, almost-bodybuilder guy here. He'll probably won't be able to gain much muscle even with all your help."
Kait eye-rolled.
"You're wrong, Li's build is changi-- you know, never mind. I'm just being nice with the kid, Marcus. If I need a muscular Adonis, I have your number." She said before kissing to shut him up.
But she never called. In fact, the next two weeks they didn't meet a single time to fuck, train or anything else (actually, fucking and training were pretty much the only things they did). She was busy with exams and family, or that was she said.
He also noticed changed in Li. He was building mass fast, in less than 2 weeks he outgrew his uniform and basketball sportwear, which hugged his thicker torso in which his newfound pecs stood out as two mountains. More midriff, now with nice 6 pack, became exposed. His shoulders seemed bigger, and Marcus would swear he had grown an inch or two more. His senpai disliked how Li was starting to dwarf him, despite his considerable height and big bulk.
The custom sized clothes wouldn't arrive until later so he had to play with undersized clothes, which attracted a lot more attention from the girls (and some boys) during matches and outside them. Another irritating thing for Marcus, who before his arrival was the most popular in school.
Did all that size harm his play? Absolutely not. For some reason he was faster than ever despite all the muscle, and his skills were improving so quick he didn't seem a rookie anymore.
Jealous. But Marcus tried to keep it for himself, since Li wasn't anything other than a pal for him. But that changed days later, when he went to the gym without telling Kaitling. He wanted some time alone and focus in himself. It was mildly productive.
But when he went to the remote showers he used to go with Kaitling, looking for privacy, he heard something coming from there.
Voices. Moaning.
A towering silhouette, holding a smaller one on his arms and pelvis.
"OHMYGOD, LI! IT'S SO BIG! AHhH!"
"It can't be..."
"NO ONE HAVE FUCKED ME SO DEEP... YOU'RE HUGE!" Kaitling's voice was unmistakable
"You're beautiful too, Kaitling" A lower, shier voice that Marcus recognized...
"CAN'T WAIT TO MAKE YOU EVEN BIGGER, MY GROWING GIANT!!"
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