Cassie nodded. "Ok, dare, huh? Oh wow, I could make you do anything!"
Rachel's eyes widened. "Uh, now Cassie, don't get carried away.."
Cassie grinned, a mischievous look in her eye. "Relax, this won't be too bad. You know how I keep saying you need to get laid?"
"What?! Wait a minute, don't...!"
"I dare you to have a screaming orgasm right now!"
Rachel felt a warmth build up in her groin, as waves of pleasure seemed to radiate throughout her body. She moaned loudly and placed her hands on her chest, rubbing her breasts through her shirt. The muscles in her legs felt like they were turning into liquid, and she backed into the wsll, leaning against it for support.
"Oh God, this feels...so good..."
Cassie watched her friend writhe in pleasure. The sight of it was seriously turning her on! She slipped off her too-large shirt and rubbed her nipples. They were much more sensitive now that she was thirteen again, and she had to bite her tongue to keep herself from letting out a moan.
Rachel slid to the floor, unable to stand at all. She tried to get her pants off, but her back arched up and she was unable to do anything but gasp for breath. She heard a loud, wailing noise as her orgasm reached a rather explosive climax.
By this point, Cassie had slid a hand down her pants, trying to relieve the building pressure of her own arousal. Rachel's scream of ectasy made her pause, and she saw her friend's eyes roll up as she passed out.
"Oh shit!" She slid off her bed and went to her friend's side. She checked Rachel's pulse, and was relieved to find it was strong. She hugged Rachel tightly, who let out a soft moan, and cuddled up into Cassie's embrace.
Cassie blushed. "Well, this is nice. Good thing nobody's home, I think that would have woken the dead!" She shifted her legs uncomfortably. "Fuck, now I'm horny as hell!"
Rachel woke up to find herself curled up in Cassie's arms. "Oh...wow...that was amazing."
"I bet, I'm jealous!"
Rachel turned to glare at her friend. "You little bitch, I should kick your ass for that!"
Cassie smiled, and Rachel was taken aback by how cute she was. "I'm sorry, but it did feel good, right?"
Rachel stuck out her tongue. "Yeah, I guess you were right, I did need that." She felt a dampness betwen her legs, and found her crotch was soaked through. "Eww!"
Cassie giggled. "Guess a shower is in order, huh? You can borrow some of my clothes, God knows they don't fit me anymore."
"Oh yeah, we need to change you back. I almost don't want to, you look adorable!"
"Adorable, huh? I could almost live with that...to tell you the truth, right now, I really could use some sex."
Rachel tickled her friend, who squirmed and shrieked. "Ha, right, you're way too young for sex!"
"Hey, stop! I'm thirteen, that's old enough!"
"I don't know, I mean, look how much smaller these are!" Rachel poked Cassie in the chest.
"Ooh.." Cassie blinked. "That feels nice."
"Does it? How about this?" Rachel put her hands on her friend's breasts, rubbing them gently.
Cassie's eyes half shut and she let out a tiny moan, her lips curling into a sleepy smile. "That's...really nice..."
Rachel couldn't believe what she was doing; not only was Cassie a kid, in all the time they'd been friends, they'd never even so much as fooled around. Oh sure, she could admit to being somewhat curious about sex with another girl, but she'd never acted on the impulse before!
But she couldn't resist the temptation of her friend's youthened state. Cassie was really cute at thirteen, and she leaned in to brush her lips against her friend's.
Cassie's eyes opened wide. "Um...holy shit, are we making out?"
"Just starting. You want me to stop?"
"Oh hell no! I want you to fuck my brains out!"
Rachel laughed, then got an idea. "Oh yeah? Transform or dare?"