About a week after their last sexual escapades, Simon, Alvin and Theodore, found themselves alone at home again. These three, as well as Eleanor still had sex and masturbated during that week, but since Dave was back home, they did not use the growth serum and had to pleasure themselves more quietly. It took almost three days for them to lose the weight that was accumulated from using it, and they didn't want Dave to even come close to suspecting anything.

It was a hot Friday summer after-noon. Dave was away again. All three chipmunk boys were playing video-games on Simon's console with their shirts off when the power went out in the neighbourhood. There wasn't much else for them to do. At least nothing Simon and Theodore were interested in... Things were starting to get boring. They were now playing a board game.

As they were playing, Simon kept sneaking peeks at Theodore's big, round belly. It was a feature that was constant for as long as either of them could remember. He found struggling to admit to the fact that he found the male form about as attractive as he did the female form. It was somrthing the other boys had faced and accpeted before him. At first he only thought of Eleanor and the other girls when masturbating. Gradually, he started thinking of the boys as well and how they expressed their affection for each other on that morning that he first had sex with Eleanor. He had sex with her on several occasions since then, but he found himself wanting something else as well. As he stared at the boys, his mind wandered and filled with lustful thoughts about them, giving him an erection. He brought his legs together and tried to hide it when he noticed that Theodore noticed being watched. But Theodore noticed. His mind was also starting to wander and his member was also starting to become erect. He stood up and looked at Alvin.

"Hey, uh... Alvin, you mind if we... play another game?" he said.

He pulled down his underwear, revealing his penis, and started slowly rubbing it.

"Ooh! Sure thing, buddy! But... you want us to "play" in front of Simon?" Alvin replied.

"Why not? You don't mind, right, Simon? I mean... you did see us kiss and rub against each other when you had sex with Eleanor." Theodore said.

"S-sure. I have no problem with it. You two... have fun." Simon said.

By the time Simon finished saying this, the two boys dropped their pants and already started masturbating while touching their glans together. A wordless communication occured when Alvin put his hand on Theodore's penis. Alvin was now using one hand to masturbate both their penises. Theodore closed his eyes. Alvin gave him a tender kiss, which quickly progressed to a French kiss. Theo started slowly humping Alvin hand as both of their penises started leaking precum. Simon had been masturbating the entire time this was happening. He decided he had enough of simply watching. He had gathered enough courage to join, got up, and started touching his glans next to the glans of the other boys. This sudden development caused the two to break their kiss and look at him.

"So nice of you to join us, Simon. You like boys too, huh?" Theodore said.

"Yeah" Simon said, his voice getting heavy from pleasure.

"Us too!" said Simon. "Girls, boys, fat, thin... tthey're all nice.

Their hands were now on each other's backs and their penises were rubbing against each other. Lots of precum was dripping from all three penises, making them slick. It was running down their shafts and balls, which were all touching each other.

"Oooooh, this feels so good. But i think we should save our dick-goo. I want some butt stuff. You two want some?" Theodore asked.

"Oh, you know it, Theo! I want to give and recieve." said Alvin.

"Um... I've nver had... ana sex. I don't think i can...receive." Simon said.

"That's okay, Simon. You won't have to. But you can put it in our butts if you want. But first... Do you still have some of that growing liquid? I want us to use on dicks. Eleanor said you made your balls and dick big before she gave you a B.J." Theodore said.

"Well... yes. I still have some of the formula.

He filled a syringe with the growth serum and connected it to a tube which went into the urehra. All three of their penises were filled with the growth serum. It caused all of their testicles to grow to about hald the size of basketballs. Their penises also grew to about the size of a standard adult penis.

"Wow! My balls are so big! I feel a sort of... pressure in them. Feels good. When we squirt inside each other, it's gonna make us really fat, right?" Alvin said.

His legs were spread and he was enjoying caressing the sides of his large testicles. He also lifted them to feel their weight.

"Yes. This method is faster than the previous one." Simon said.

"Mmmmmm... I wanna suck on your big, juicy cocks." Alvin said seductively.

"Alvin's developed a taste for that during the times we played together. Among other things..." Theodore told Simon.

Theodore and Simon were standing together side by side. Alvin got down on his knees and started fellating both of them. While he sucked on their cocks, he was also playing with their balls, carressing them, lightly squeezing them and gently pressing both sets of balls against each other. He was stroking their penises, while licking their glans and sucking on them, drinking precum in the process. Theodore was playing with Alvin's hair and Simon was reaching around his back and caressing Theo's big belly. Both of them felt themselves getting close to an orgasm. Theodore suspected Simon was getting close by hearing his breathing get heavier and seeing him close his eyes while lifting his head upwards and keeping his mouth open.

"Oh, Alvin... You've gotten really good at this. But i think we should move on to the next part. I want Simon to save his hot goo for my butt." Theodore said.