About half-way through the last set Pete couldn’t take it any more. He reached out, slipped his arms around Cassie’s waist, and pulled her back against him. He was half afraid she’d scream, but he’d reach the point where his self-control was basically shot. He was willing to take the chance. She didn’t scream, and Pete almost shot his load right there as he felt the warmth of her leaning against him.

“Are you trying to get us arrested?” Cassie sounded nervous, but not mad.

“Why? I’m not doing anything the rest of the guys aren’t doing with their girlfriends.” Actually, there were plenty of make-out sessions going on with some fairly serious action, a lot more than just two kids leaning up against each other.

“I’m not your girlfriend, remember, I’m your sister.” She at least had enough sense to say it so Pete was the only one who could hear.

“Nobody here knows that unless you tell them.” Cassie didn’t say anything more, didn’t try to pull away. Pete took a bigger chance. As the next song started up, he slid one hand under the bottom of Cassie’s tank top, let his fingers graze over her belly. She twitched a little, her butt moved back against him. Pete bit his lip, concentrated on the music, anything to keep his mind off his dick for a couple of minutes. Cassie’s skin was soft, warm. Pete’s fingers roamed up and down slightly, tracing along her rib cage, then down to her belly button and just below. He didn’t let them go too far either way. He was still afraid of what Cassie might do.

Pete discovered something new during the next couple of songs. He could concentrate on the music and Cassie at the same time, and each made the other more fun.

Cassie had almost jumped out of her skin when Pete put his arms around her. Not because she minded, but she really didn’t think he had it in him. She figured he was never going to touch any girl, let alone his own sister. Cassie figured it was cool that he did, though. She wasn’t going to get any other action here today. Believe it or not, it was the first time a guy had ever touched her anywhere on her skin. The one who’d felt her boobs had done it through her blouse. Great life. Fourteen years old and this was the most action she’d ever gotten. She relaxed, closed her eyes, and let the feeling of her brother’s fingers on her skin wash over her.

As the evening wore on, and the high of the pot and music carried Pete along, he got braver. He let his fingers move more on Cassie’s belly. His left hand joined his right. The first moved up, closer and closer to her tits, the other down, farther past her belly button, the tips of his fingers playing along the waistband of her jeans.

He felt Cassie’s hand close over his wrist. He’d finally gone too far, she was going to stop him from moving his hand down any more. But no, she was shoving his hand down into her jeans. Pete felt the light hair between Cassie’s legs as his fingers reached lower. She leaned back against him, her head resting on his shoulder, legs spread apart, and he thought he heard her let out a soft moan.

Cassie still couldn’t believe Pete was brave enough to do what he was doing, but she was going to take advantage of it before he came to his senses. When she felt his fingers at the waistband of her jeans, she forced the issue before he could stop. Now she felt his fingers inside her panties, creeping toward her slit. She moved her legs apart to give him room, moaned his fingertip brushed over the top of her slit. She was right up against the fence, so nobody could really see what was going on.

Pete’s fingers were moving on their own again now, cupping her crotch, rubbing it. His other hand had reached the bottom of her boobs. Cassie’s body tingled with new sensations. The one time a guy had played with her boobs it had been just a couple of quick squeezes. She’d never played with herself. She’d thought about it, but wanted the first time she got touched to be by a boy. Not that she wanted it to be her brother, but today she was going to take what she could get.

“Can I put a finger in?” It was a hoarse whisper, barely audible in her ear with the music echoing around them. She wasn’t really even sure Pete had said it, maybe she only imagined it. But she didn’t care.

“God, yes!” she hissed. Her body shivered as Pete’s finger slipped between her lips and up into her. She shoved her hips out, taking the finger deeper, then bit her lip as she tried to control herself. Up against the fence or not, if she started humping Pete’s finger like some kind of wild animal, somebody was going to notice.

*
Shit, it was hot and wet and he could feel it like squeezing his finger. Pete was almost in a trance, his sister writhing against him with his finger up her pussy. Yeah, his finger was in her pussy. Damn. But she was enjoying it maybe a little too much. They didn’t need anybody paying attention to what they were doing.

“Don’t go crazy, we’ll get to go back to the car pretty soon.” He felt her relax, stop wiggling so much. He didn’t take his finger out, though. In fact, he let it move in and out of her a few times. Her body trembled against him when he did that, and he heard her breathing get heavy. It was all he could do to keep from shooting, and to keep from ripping his sister’s clothes off.

They stood there like that through a couple more songs, then the concert was done. Pete knew there wouldn’t be an encore, these guys never did that. He whispered to Cassie again.

“We can head back to the car now.” He slowly slipped his finger out of her, let his hands pull out of her clothes. But before he could turn to start walking, Cassie whipped around, still in his arms, and reached her face up to his. Their lips met, parted. It was the first time he’d ever kissed a girl, but he knew what to do, letting his tongue slip into her mouth, start to explore. He got the feeling that it wasn’t the first time Cassie had been kissed. Her body was plastered against his, he could feel her tits through his t-shirt and her tank top. Her hips were grinding against him, torturing his cock even more.

*
Cassie was stunned that her brother kissed so well. She was sure he’d never done it before, but it was a lot better, and a lot more exciting, than the other guys she’d kissed. His hands were on her ass, pulling her tighter against him, and she had to fight an urge to wrap her legs around his hips.

Then he was pushing her away, saying, “Come on, let’s get back to the car.” He took her hand, the way he had when they’d come in, but it had a different meaning now. She watched him kind of waddle across the field.

“You’re walking funny.” She giggled. He turned around, glared at her for a second, then relaxed and smiled.

“I don’t wanna hear about it, it’s your fault.”

“Hey, don’t blame me, you started it.”

“Just come on.” He was in such a hurry he almost pulled her off her feet.