The first shot of jizz described an arc as it left the tip of Jack's cock, landing just above his collar bone. By far the strongest orgasm he'd ever had, subsequent spurts followed as he emptied his sac, eyes squinched shut and his mind intent on one of the wrongest things he'd ever contemplated.
But let's back up a moment. Jack had just returned home after his freshman year in college. In high school he'd earned a reputation for being a determined scholar athlete, and it had paid off in a full ride scholarship at a top tiered university. What it hadn't really afforded him was much of a chance to develop a social life. College had turned out to be even worse, carrying a double major in business and IT, and making the varsity teams in soccer and indoor and outdoor track and field had kept his social network casual to say the least.
Not that there hadn't been interest. But nothing that seemed to have any traction. Some light dating, making out here and there, but academics and athletics really left him with little time for anything to develop beyond that. And frankly, he found that if he was crushing on a girl, he generally had difficulty even conversing with her.
So when Jack arrived home he was surprised to be met at the door by his little Sis, who was leaving for a run. When he'd left for school the previous fall she was all knees and elbows and skinny as a rail. Well some people blossom fast, and that had certainly been the case with Hannah. Still only about 5' 2" she'd filled out in the most amazing way. She met him at the door wearing a spandex running onesie and a visor, her long red hair gathered in a bun. Jack couldn't believe she was the same girl he'd known his whole life. She'd gone from skinny nerd girl with extra-large braces to hottest hottie in under a year.
"Hey, Jack! Welcome home!" she said waving at him as she started jogging down the driveway. He waved back and watched her as she turned down the street, picking up the pace. She'd always been a decent runner but she'd gotten some lean bulk and she moved with an easy gait. It was stunning.
Her voice had lost most of its adolescent edge, and had instead taken on a more adult tone that retained a sultry lilt. Little Sister was growing up. He shook his head and went inside. It was nice to be home and he couldn't wait to see Mom and Dad.
Hannah was watching TV when he woke up the next morning. It was Saturday and he'd let himself sleep in after the long drive home yesterday.
"Whatcha up to, Sis?" Jack asked as he poured himself a bowl full of breakfast cereal.
"Not much, Bro. Mom left me some chores and there's this new anime that Reinhart told me about, so I wanted to start watching that." she said.
"Are you guys still going out?" He asked flopping down on the couch next to her with his cereal bowl.
"Hard to tell." she said quietly as if to herself.
"What do you mean?" Jack insisted.
"He got early acceptance to Harvard. Ever since then he's been...distant. I mean even more distant than usual." She said. "Busy making plans, I guess." She added.
Hannah and Reinhart had been a nerdy couple since about halfway through freshman year. At first they'd been geeks of a feather. Jack was surprised that that had changed, Reinhart certainly wasn't going to find a girlfriend hotter than Hannah and Jack wondered at how reserved she took it. In fact, Hannah seemed to be taking it all in stride.
She leaned in and picked up the remote from the couch cushion. Jack saw the sway of her breasts beneath the oversized T-Shirt she was wearing. Her tits had grown from beestings to large C-cups and were firm but unfettered and Jack caught a quick breath as he leaned forward involuntarily, but in vain. A split second too late to get more of a view. She was amazing. Reinhart was a dick.
Hannah got up from the couch and went into the kitchen for a glass of orange juice. Jack watched her athletic hips sway in a completely unintentional sultry way, and that sealed it. An hour later Jack was beating off in the shower, his mind filled with impure thoughts about his little Sis. But it was just beyond resisting them he thought as he came in thick ropey spurts. It gave him some relief. At least a return to sanity...for a while, at least.
"Jack, have you seen the keys to the minivan?" Hannah asked from the hallway.
He was almost there... when he saw it. His door was open just a crack, and it was too late to get up to close it. He shot his load as quickly and efficiently as he could. Listening for Hannah moving around outside but hearing only silence. He could sense her there, outside his door. It was so embarrassing. Shameful. He wiped up the messy goo and grabbed his pants.
Hannah was quiet around him for the next couple days. It was Friday night when she broke her silence. Mom and Dad had gone out to dinner with friends, and they'd settled on the couch watching the end of the anime series Reinhart had told Hannah about.
"Jack?" Hannah said quietly. "Jack I saw you before. I know you know. I was just so embarrassed, I couldn't think of what to say."
"I know. I feel the same way." Jack admitted. "Let's not talk about it."
"It's not weird that you were doing that. Just weird that I saw it." Hannah said. "I mean weird that I watched you and..." she trailed off into silence.
"You and Reinhart, must've...." Jack tried.
"Honestly? He never really wanted to." Hannah said. "I mean, I gave him a few hand jobs, but it was more awkward than exciting. I know he was my boyfriend but... I was starting to wonder if maybe I was more into girls..."
"Are you?" Jack asked.
"I... ummm don't think so?" Hannah replied. "When I do... what you were doing... I don't think of girls... but..."
"Go on, Hannah. You can tell me. I'm your big Brother." Jack encouraged.
"Jack, Reinhart...was... well... Jack, you're fucking huge." Hannah blurted out.
It was as if the dam had burst. "I was thinking, maybe I'm into girls. Maybe that's for me. And then I saw you through the door and I couldn't unsee it. I couldn't. And I know how wrong that is, but... I just... didn't know what to say to you after that." Hannah confessed.
"I know." Jack replied. "You grew up so much when I was away at school. I just thought that I need to find a place for this that isn't wrong. That's why I go to my room."
"Do you, ya know...fantasize, ya know...about things?" Hannah asked obliquely.
"Okay, yes. I'm totally lame. I jerk off thinking about my hot little Sister." Jack admitted. "Not that I'd ever do anything about it." he added.
"I know. It's wrong. And we can't." Hannah stated. "But you think I'm hot?"
"That's right. We just can't go there." Jack replied as he got up and left the room.
Hannah couldn't remember a time that she hadn't had a crush on her older Brother. He was a Jock and Student council leader. He was handsome and always stood up for her. And she was little miss tag along, not that Jack ever really made her feel that way. So when she'd started dating Reinhart, she thought that it was the solution to those feelings. But it never really felt the same with Reinhart. He was always just a little cold. Stuffy. Boring.
