Cody tried desperately to keep from overtly staring at Zack as he shed his wet clothes. There was definitely a significant portion of him that wanted Zack to go further and put his boxers in the bag too. He wasn't disappointed though. His white boxers clung to him like lycra, the water making them transparent enough to the point where they were tinted with the shade of Zack's beautifully tanned skin underneath. That was something Cody always envied him, even in the depths of winter he seemed have a positively golden glow while Cody felt positively albino in comparison. He tried to draw his eyes from the obvious bulge in the front, but it brought a strange thrill to him. He wanted to get closer to investigate. It was simple innocent curiosity as they were twins, or so he tried to console himself. It had been years since he'd seen Zack naked. Zack was taller with considerably broader shoulders. He wondered how else he'd grown. Even though they shared a room, they both usually got dressed in the bathroom after having a shower or wore pajamas. One night about a year ago during an exceptionally loud thunderstorm he'd crept over and got into Zack's bed. To this day Cody wasn't sure whether he was completely naked or just shirtless, but he still relished the thought as he'd nestled up in his brothers body heat.
Once Zack had removed himself to the bathroom, Cody dragged the sack to the washer. He knew if he didn't do something with it, it'd all sit in a cupboard growing mould for weeks. The clothes smelt so strongly of Zack that they immediately drowned out the general aroma of apples and caramel. Zack and a hint of wet dog maybe. He loved it; he wanted to savor it, but he forced himself to snap out and threw in the detergent. It was then, too late, that he realised he'd left out one of the socks. Sighing as he picked it up, walking towards their bedroom, but stopping half way when he couldn't help lifting it to his nose. Cody realized his dick was practically bursting through his pants. It was the first time in a long time anything had turned him on. He hardly ever masturbated. He'd learned about the concept about 5 years ago in a biology textbook he was reading and it was then confirmed in detail a couple of years back in health class. At first he had tried hard to mentally focus on Alissa, a girl who everybody at school agreed was insanely hot, objectively he didn't disagree.
To say the least though, it didn't get him anywhere, and he soon gave up somewhat frustrated. He'd wondered whether he'd had some awful medical problem and would need Viaagra or something before he was out of his teen years. Thinking about it embarrassed and depressed him. He felt alive though, as he stood with Zack's sock pressed up against his face, rubbing his crotch through his Tipton issue robe.
He was brought back to reality by the sound of the bathroom door closing and Zack padding down the corridor. Panicking and for lack of pockets, he shoved the sock into his briefs and tied the robe tightly shut.
The evening was somewhat uneventful though after Zack had emerged, looking considerably more relaxed. They both downed oversized portions of pizza and Cody's pie before laying bloated on the couch: Zack playing video games and Cody skimming through a book.
To Zack, who was playing little or no attention to the game, Cody seemed distracted. He couldn't help trying to catch glances of his brother's crotch, which seemed to have doubled in size. Meanwhile Cody was lost in his earlier fantasy, still very much aware of the sock being pressed firmly into his genitals. It itched so badly, he was desperate to scratch ("Zack probably has fleas," he thought to himself) but he couldn't bring himself to move to the bathroom to take it out. He enjoyed the feeling of being tightly constricted by his underwear, he didn't even bother to move his robe to try and cover it.