Dodge the bullet

Jon approached the confused Karyn. Her canine penis was bulging from its sheath.
"Karyn?" Jon padded past him. Karyn sniffed the air, his tail smoothly wagging from side to side.
"J-Jon! Oh man... I'm... so horny! And you smell so good!!" he sniffed at her sides, unconsciously making his way to Jon's backside.
"No! Karyn! No!" Jon forced her tail down between her legs. "You can't... we can't! If... we do..."
"But Joooon, I want it sooo much!!" Karyn groaned. "I... I'm so sorry! I need it! Being foxes won't be so bad... right!?" He reared up and mounted Jon, thrusting his cock between her legs.
"Move your tail!" Karyn commanded! Jon felt a warm, soft heat coming from his backside. He wanted so badly to be penetrated by Karyn. By her hard, throbbing knot...
"How cute. Don't resist, I want some new pets!" Sarah taunted.
Jon felt the tip Karyn's cock enter into her. A blash of fleshy pleasure spiked through her, and she thrust her backside towards him. He went in deeper, and began to thrust in and out. Jon didn't even know he had moved his tail!
"That's right, keep it up. Once you climax, you're foxes forever!"
"N-no! Karyn! Stop! Kaaaaryn..." Jon's tongue lolled out, intelligence giving way to instinct. Karyn was completely losing it now, pounding her cunt harder and harder. His knot was almost into her now...
"No! Karyn, once you get that bulge in you... can't... get... oooutt..." Forcing all of his willpower together, Jon leapt forward, dragging Karyn with her. She pulled out a little.
"Jon... no, please..."
The vixen flailed around, until finally Karyn fell off of her.
"No! Think Karyn, only a month. I don't wanna be a fox all my life!" Jon forced her tail back between her legs, and vowed to keep herself covered. Pure lust had overtaken Karyn's eyes. Her tongue hung out of her mouth wildly.
"Fuck... Jon! Can't control..."
Jon had to admit, it was hard to control her hormones. She wanted so desperately to feel climax.
"Just... rub off. As long as we don't..."
"I... I think I see..." some spark of intellect formed in Karyn's mind. Laying low to the carpet, Karyn rubbed her cock against the soft carpet. It wasn't bad. Then Sarah's leg. Then the couch. Karyn rubbed against everything he could, breathing deeply to catch the scent of Jon. Finally, she reached orgasm and came all over one of Sarah's plush toys.
"Thank you, Karyn!" Jon was rubbing against whatever she could too, trying to sate her lust.
"Alright, I get it." Sarah laughed, "As long as you don't mate with each other and climax, you still have a chance. And you're just gonna make sure Karyn is always spent so she can't mate with you. But... you'll both be in heat all month. Think you can you last that long?"
Jon cursed. She was right. She had barely averted a horny fox from stealing her humanity and her chance of ever being male again. Off in the corner, Karyn was panting and cooling off.
Jon wasn't sure they could make it a month without going all the way.