Please read the three previous installments to get the context of the story. As always, all characters are at least 18 years old.
When Jimmy awoke the next morning, he wondered if the previous day had all been a dream. He had arrived at his girlfriend, Allison's house, a bit early and had spied her giving her own father a blowjob. Watching from an upstairs window, he had watched and then gone into the bathroom and beat off. Later, she was about to do the same, or more, with him when they had been interrupted by her father calling her to tell her that he had had a fender-bender and needed her to come to the hospital to pick him up. Then, most mind-blowing of all, his little sister, Jill had given him not one, but two, blowjobs. She had admitted to him that she was addicted to his cum and wanted it every day.
Incredibly, despite the fact that he had cum 3 times the previous day, he was as hard as a rock and felt that he needed to beat off. But no -- his sexy little sister had told him that he could count on her any time that he was horny. He also knew that their parents would not be home all day. He jumped up, went into the bathroom, took a leak, brushed his teeth, then showered. After throwing on a pair of boxers, he knocked gently on Jill's door.
"It's unlocked," he heard her say. Jill was still in bed, under the covers. She smiled. "I heard you in the bathroom," she yawned. She sat up and nodded to his obvious erection. "Do you need your little sister again, so soon? Mom and Dad already left."
She stretched and yawned again. Jimmy could see the outline of her breasts against the thin t-shirt that she wore. He wondered if today was the day that she would allow him to see her naked -- something that she thus far had refused to allow.
He sat on her bed and peeled her covers back, revealing her shapely legs. She quickly pulled the t-shirt down so that her panties were covered.
"I want to kiss you, but I want fresh breath," she grinned. "Give me time to at least brush my teeth and shower, okay?"
Jimmy nodded. She rumbled through a drawer, brought out a handful of clothes and went into the bathroom, closing the door behind her.
Five minutes later, she reappeared, now dressed in tiny, white, and very tight terry cloth shorts and a cut-off t-shirt that Jimmy had seen her wear only a couple of times. It showed off her very flat and toned tummy and was cut almost to her breasts. Jimmy thought that the slightest move would reveal the undersides of her breasts. To him, she looked sexier than he had ever seen her.
Jill practically ran into his arms, and they began kissing immediately. She moaned as he snaked his tongue into her mouth and began running his hands over her body, between the two scanty articles of clothing that she wore. He very slowly stroked her stomach until one hand was very lightly against the underside of her right breast.
She reached and moved his hand down, just a couple of inches as they continued to kiss. She moved her hand between his legs and grasped his erection through his boxers.
Jimmy grabbed her hand and moved it back up his leg. Breaking the kiss, he said, "Why can you touch me if I can't touch you?" He looked into her eyes.
She smiled. "Jimmy, come on," she whined. "You know that there are lines we cannot cross. If I let you touch me, that will lead to something that we absolutely cannot do. Right?"
"Ok," Jimmy said, trying to keep from laughing. "If I can't touch you, you can't touch me."
"You don't mean that!" she grinned as she reached, again, for his hard cock.
As she leaned across him to do so, he reached for the cut off shirt and raised it up, revealing one breast. Jill quickly pulled it back down and looked angrily into his face. Seeing his look of disappointment, she suddenly grasped the bottom of the shirt and pulled it off, over her head. She sat back, thrusting her chest out, allowing her brother to evaluate her upper body. Her B-cup, almost perfectly spherical orbs sat proudly on her chest, the quarter-sized nipples hard as stone. It was such a turn-on to finally show them to a boy -- a man -- her brother!
"Fuck, Jill! You... they... fuck! Fuck, Jill!..."
She laughed. "Is that good or bad? They're just tits."
"Just tits?" he managed. "Jill... you're perfect! They're... beautiful. You're... gorgeous!"
Jill had already been turned on by the prospect of sucking her handsome, well-hung brother off again, but now that she was half-naked with him and he was obviously so impressed with her breasts, she felt hornier than she ever had in her life. She knew that her panties were already wet and wondered if Jimmy had noticed how wet the crotch was.
She reached for the waistband of his boxers and quickly had them down his legs and off. She got between his legs and immediately began to lick the precum from his shaft and the swollen head. She swiped her tongue around the corona and looked into his face. She felt a euphoria wash over her that she now realized occurred every time she tasted him. There was nothing in her young life that excited her like this -- she recognized it as a genuine addiction and was already wondering if she could ever be sated by another man, or men, other than her beloved brother.
Jimmy grasped her hand and gently pulled her up on top of him. He pushed her blonde hair back from her face and began kissing her again. She fucked his mouth with her tongue. They both moaned incessantly as he sucked her tongue, then he sucked hers. His hands caressed her naked back and upper legs before grasping her firm ass with both hands and squeezing. She breathlessly nuzzled his neck, kissing him there, then moved lower to kiss his muscular chest. She licked and sucked at his nipples in a frenzy of lust.
She reached to fondle his throbbing cock as she continued to lick and suck his chest and neck and mouth. She was gasping for air, almost hyper-ventilating. She hunched herself against his leg, moaning, near orgasm. She licked his ear and gently bit it and whispered, "Oh Jimmy, you make me so hot!"
