"Dude, I could hear you all night last night!" Tim whispered under his breath as soon as Jackson came into the kitchen.
Jackson looked startled for a moment and then grinned down at his younger brother, "You learn anything you little shit?"
Tim glared and began to respond before his mouth snapped shut when saw Alisa, Jackson's girlfriend from college walk in behind him. Tim tried not to stare at Alisa who was only wearing a crop top T shirt and athletic shorts, the bottom curve of her full C cup breasts just barely exposed beneath the edge of the thin shirt. Tim had to admit he had a crush on Alisa, her long blond hair, green eyes, oval face and athletic body enough to get the attention of any warm blooded high school guy, but after last night...
"Morning," Alisa said cheerfully and smiled down at Tim as she walked over to the fridge, "Jackson and I were going to go the beach today and was wondering if you'd like to come?"
Tim felt his face flush as he thought about the sounds of Alisa moaning in time with the creaking of the bedsprings, the headboard of the bed in the adjacent room thumping against the wall of the guest house he, Alisa and Jackson where sharing while their parents had the main house to themselves.
"Oh, I'm sure he'd love to come," Jackson said with a laugh.
Tim thrust his hand with his middle finger raised towards Jackson but quickly lowered it when Alisa turned around with a cream cheese and bagel in hand.
"Awesome!" Alisa said with a huge smile, "I think I saw flippers and snorkels in the shed so we could go snorkeling!"
Tim tuned out the rest of the conversation and tried to ignore the outline of Alisa's nipples against the fabric of her shirt or the occasional flash of under boob as she finished making her bagel and sat down at the table. He was still a little shocked that Sue and Bill, his parents, had seemingly accepted Alisa as if she were one of the family to go on their yearly vacation after Jackson had brought her home without so much as an introduction. Jackson and Alisa had been pulled aside into the home office for almost an hour, Jackson confessing afterwards that the conversation had been about STD's and if they were using birth control, and then Alisa and Sue had become nearly inseparable for the entire drive south. The house they had rented this year was one of the better ones they had ever stayed at being only a few blocks from the beach with a large, spacious main house, a pool, and even a guest house that Tim and Jackson had decided to claim as their own as soon as they had arrived.
What Tim hadn't expected was how thin the walls of the guest house were or being awakened by the sound of his brother and girlfriend making love.
For almost an hour.
"Hey, you little shit, you listening?" Jackson asked.
Tim jumped and sat up straight in his seat, his face again flushing as he tried to conceal his erection beneath the table.
"You shouldn't call him that!" Alisa admonished.
"He was probably daydreaming about you moaning last night," Jackson said and then burst out laughing when Tim's face flushed a brighter red.
Alisa seemed to give Tim a considering look before smacking Jackson on the back on his head hard enough to rock his head forward.
"Hey!" Jackson cried out with a surprised look at Alisa.
"Be nice," Alisa said and then turned back to Tim, "Jackson and I were wondering if you wanted to go snorkeling?"
Tim quickly agreed, the rest of the day flying by as the three of them enjoyed the crystal clear waters and beautiful beaches of south Florida before ending out the day by having dinner at a sit down restaurant with their parents.
Tim tried to be respectful around Alisa, tried not to be too obvious in his noticing her very small two piece bikini with the tiny thong back or the very public displays of affection that Jackson and Alisa would show. Tim even had the impression more than once that Alisa was intentionally flaunting her bikini, intentionally pulling Jackson into a long, lingering kiss whenever she caught Tim looking. More than anything else Tim wondered how Jackson who was only nineteen and just a little over two years older than him hand managed to get so lucky as to end up with Alisa in the first place. As soon as it started to get late and Tim's parents left for a night out on the town Jackson and Alisa made for the pool, Jackson grinning as he removed Alisa's bathing suite top and tossed it up onto the deck.
"Jackson!" Alisa had said with a laugh, but Tim noticed that she didn't do anything to hide her exposed breasts either.
Jackson and Alisa had continued to wrestle and splash each other in the pool, but after on a few minutes of staring at Alisa's breasts every time her antics brought them above the surface of the pool Tim excused himself and retreated to his room so that Alisa wouldn't see his growing erection.
"Don't jerk it raw you little shit!" Jackson called after Tim as he tried not to obviously hurry away while covering the front of his pants.
After a hasty and decidedly cold shower Tim found himself lying in bed struggling to hear the slightest sound from the next room. He was still laying in bed wide awake an hour later when he heard the muffled sound of voices and the occasional laugh through the wall and then the sound of bedsprings creaking as someone, Jackson or Alisa climbed up onto the bed. Tim strained to hear the slightest sound as he lay perfectly still but only managed to catch the occasional muffled word for nearly a half hour. When Tim finally heard a soft moan he still wasn't sure if he had only imagined the sound or not. After a few more minutes Tim was definitely sure he heard Alisa moan and burst out giggling for a moment. Tim's hand slipped down beneath the waistband of his boxers while he imagined Alisa laying on the bed naked, Jackson's hands kneading her breasts while they kissed.
More soft moans filtered through the wall accompanied by the creaking of the bedsprings as someone changed position, Tim squeezing his hard shaft in his hand while still straining to listen. More half heard words filtered through the wall as Jackson and Alisa talked for several minutes, Tim trying to imagine what exactly they were saying to each other, what exactly they were doing to each other until his heart skipped a beat as Alisa let out another moan. The bedsprings again sounded as someone shifted position and then began to squeak in a slow rhythm, Tim biting his lip as his hand began to stroke his length in time to those squeaks.
"Ohhh, you feel so good inside of me," Alisa said loud enough for Tim to hear her clearly.
Tim's hand began to move faster until he intentionally slowed his pace to match the sound of the bedsprings.
"Oh, god, harder!" Alisa suddenly cried out causing Tim to jerk in surprise.
The pace of the sounds coming through the wall never changed, but suddenly the squeaking of the bedsprings was accompanied by the soft thump of the headboard hitting the wall, Alisa moaning loudly with each and every thrust.
"You're going to make me cum!" Alisa suddenly exclaimed, "Oh, just like that, oh, god, don't stop!"
Tim licked his lips while squeezing his shaft and stroking up and down his length while imagining Alisa's legs wrapped around Jackson's waist, her arms wrapped around his torso as she cried out in pleasure.
"Ohhhhhhhh!" Alisa cried out and then suddenly the sounds from the other room stopped.
Tim tried not to curse since he had been so close to cumming himself and tried to listen to any other sounds from the other room. He was really surprised since Alisa and Jackson had had sex for nearly an hour the other night and it had seemed like they had only just begun now when everything had become quite. Tim could hear the occasional muffled voice, Alisa's giggle and then jerked in shock when someone actually knocked on the wall.
"Hey, little shit!" Jackson called out through the wall.
Tim lay perfectly still hoping that Jackson was only guessing that Tim was eavesdropping until Jackson pounded even harder on the wall a second time.
"Ok, little shit, if you don't want to that's fine by me, but Alisa was wondering if you'd like to watch her get fucked," Jackson said loudly.
"Be nice!" Alisa said clearly through the wall.
Tim's eyes widened in shock as he lay in bed until he jerked at the sound of Jackson pounding on the wall again.
