Alex jerked awake as a crash of thunder shook the house and flashes of lightning briefly illuminated his bedroom. He instantly became aware of two things: the power was out since his fan wasn't turning and he had a painful case of early morning wood. Another flash of lightning and a peel of thunder. "Jesus Christ!" Alex struggled to get out of the twisted bedsheets and opened the blinds of the nearest window. he was convinced the house had just gotten struck by lightning!
The rumble of thunder was slowly receding as he peered into the darkness outside. All the street and porch lights were extinguished and he realized the power was out for the whole neighborhood, at least. There was another quick succession of flashes and another roiling of thunder. For a brief moment he could see the houses and swaying trees on their street. Then rain began to pelt the window and soon the water was coming in torrents.
He picked his phone up off the nightstand. Shit. 4:35. He was going to have to get up for work in a couple of hours. Alex doubted he'd be able to go to sleep. He felt his cock twitch and absently ran his hand over the lump in his boxer briefs. Maybe if he jacked off it would make him sleepy.
The door of his bedroom opened and Alex spun around, shielding his eyes from the sudden light that met them. "Fuck, turn that off!" His little sister Madison didn't turn off her phone flashlight but did lower it to the ground. In her other hand she held an electric lantern. As Alex's eyes adjusted he could see his sister was in her pajamas which consisted of a pair of loose, white cotton shorts and matching crop tank top. He absently noted she wasn't wearing a bra as he could see the outlines of her nipples from behind the fabric. The large, brown eyes of her heart-shaped face shone in the meager light. Her plump lips parted, showing the hint of white teeth and the shine of braces. Her long, black hair was fixed in a one braid in the back and errant wispy strands hung down over her face.. her perky breasts, a healthy B cup at least, rose and fell with her arrhythmic breathing. "Can I sleep with you?" Her voice was high-pitched and in a near panic as she began to bounce from one foot to the next.
"What...?" Alex shook his head. "Shit, Maddy, you're eighteen now. A little old to be sleeping with big brother, aren't you?"
"You know I have a condition!" She stamped her foot petulantly. "And dad's at work or I'd go sleep with him!"
Alex shook his head. It was true, as long as he could remember Madison was afraid of storms. Until recently she'd always had their sister, Alison, who she shared a room with, to comfort her. But Alison was now out of state at college. Dad had started working the midnight shift and mom was long ago out of the picture so now it was just the two of them in the house tonight.
"You shouldn't have to be sleeping with anyone just because of a little storm!" As if on cue another bolt of lightning flashed and thunder roared, causing them both to jump. Madison reflexively dropped her phone and lantern and was suddenly pressing herself against her brother, wrapping her thin arms around him. Alex was unclothed with the exception of his boxer briefs and the touch of her cool skin was rather pleasant against his bare flesh. He sighed with a mixture of aggravation and unexpected excitement as he put his lanky and muscled arms around his little sister to comfort her.
Madison shuddered against her brother, virtually wrapping her petite, 5' frame against his lean, tall body. Alex could feel warm tears running down his torso as his little sister buried her head against his chest. "Wow, you're really scared, aren't you." He ran his hands up and down her back, trying to comfort her and ignore how good her slim body felt in his arms.
"Oh," she softly exclaimed. Alex had forgotten about his erection, which was now pressing firmly against his sisters lower stomach. She ceased shuddering and was still, though didn't pull away.
"Sorry," Alex laughed a little as he whispered into her ear. "Kind of woke up with some morning wood."
There was silence between them for a moment as the last bit of thunder faded into the distance and the rain continued to pelt at the windows. "Is that why you didn't want me sleeping with you?" Madison asked timidly as she looked up at him.
"Uh," Alex began. His erection gave another involuntary pulse against his sister. She giggled.
"Whoa it's really excited, isn't it?" She pulled away from Alex and looked down. From the floor Madison's phone and lantern cast light up from underneath them. Alex looked down at the bulge in his shorts. it gave another twitch as he felt his sister's eyes upon it. "Oh wow," she giggled again. She looked back up at her brother. "If I help you with that will you let me sleep with you?"
Alex was dumbfounded. "Uh, you're joking, right?" In answer Madison reached down and rubbed two fingers over the visible outline of Alex's cock head, causing him to shudder slightly and his hard to grow even more. "Jesus, Maddy." Alex felt like he should stop her but simply stood there, his arms still around his sister's tiny waist.
Madison grabbed and pawed slowly at his bulge, rubbing her hand up and down and back and forth, all the while looking up at her brother's face. "Is it a deal?" All Alex could do was nod and Madison grinned a little and hooked her cool fingers under the waistband of Alex's underwear and pulled them down. With a sigh of relieve, Alex felt his cock spring out. "Oh wow that's a fat one." Madison purred as she began to run her fingers along the six-inch length of her brother's exposed penis. She wrapped her fingers around it and they wouldn't meet. "Damn it's like a soda can!" She giggled as she slowly began to pull it back and forth.
Alex was beginning to feel light-headed as his heartbeat increased and his breath came in sharp bursts. Was this really happened? He wondered if he was dreaming and willed himself to wake up. After all, it wouldn't be the first time he had a sexual dream about one of his sisters. He closes his eyes then opened them. No, he still stood in his darkened bedroom with his younger sister tugging at his cock. He felt like he should stop her but found himself powerless.