Some bets give even if you lose (old and young)

"I stole it from dad's lab, it's some kind of **** that can mess up with your hormones." John said.

Jane looked at the vial her brother brought.

"It's the stuff that was supposed to be used as a chemical agent to stop wars or something?"

"Something like that, yeah."

The purple liquid didn't look much, but their dad was a genius, so it must be effective.

"I bet you wouldn't resist the effects." John told her.

"You crazy? It's still in test phase, I wouldn't even try it..."

"Wooh, chicken, chicken!"

"Fuck you John! I won't do it... for less than 200$!"

"200?! You're hard in business... 150!"

"150 and you clean up my room for a month!"

"Deal!"

Jane took the vial and opened the cork and took a sniff. It smelled like lavender, and at first nothing happened.

"You owe me 150!"

"Wait a little bit."

Slowly but steadily, Jane started to feel aroused, really aroused. She obviously hid it from him, but it soon became hard to resist the urges she was having. Breathing fast and sweating, she gave up the acting and run away. If she stayed longer, she would have jumped her own brother.

Going out the house, she was feeling hot and horny, she needed a dick, badly. And she didn't have the time to pick the person attached to it. The old neighbor was a man, he had a dick, she rushed to him.

"Please fuck me, I need a dick right now!" She told him, starting to take off his clothes.

"What the fuck, little slut? Some stupid bet with your brother again?"

She didn't answer, overwhelmed by her desire.

"Alright, then, slut! I'll give you a dick."

He took her off the front yard and went in the back to get fully naked and started to fuck her. She was drooling wet and moaned just by rubbing his cock against her slit. Jane didn't have any conscious thoughts with all the pleasure and arousal piling up. He fucked her again and again, until he started to see stars and feel light headed.

Jane came back to her senses, cum leaking out of her pussy, next to her old neighbor ****. After making sure he was ok, with few taps on his cheek, to wake him up a bit, she left the garden, her clothes in her arms.

"Shit, sister, that was wild..." John said.

"Fuck you, never talk about this, not even to me! I'll pay your 150."

She went back to college at the end of the week and didn't come back before another six month. But when she came back, she went to her brother's bedroom quite angry and looking like a mess.

"Your fucking bet really fucked me up, asshole!" She told him immediately.

Lifting her sweater, she showed a round belly. Bigger than a six months belly should be.

"I've quadruplets from that day!"

"Oh shit!" He could only answer.

"I'll be home for a little while..."