This time, Fluttershy was the one who was surprised as Spike's tail wagged more than it had ever wagged since he arrived and he said in an excited tone of voice "Sure!"

Well... that was easy, Fluttershy said "Really?"

Spike said "Yeah! I've never had sex before! Let's do it!"

That gave Fluttershy pause, Spike was a virgin, she had never considered the idea that some animals might be virgins. Then again, did it really matter? If Spike was a dog actively wanting to have sex with her, then did it matter that he was a virgin? She mentally face-palmed herself, all this time thinking about the logistics of having sex with Spike could have been time better spent actually having the sex!

Fluttershy got into one of the stalls with Spike following behind her, closing and locking the door, Fluttershy got down on her knees, slipped a hand in between Spike's hind legs and began to gently fondle his balls . Spike was panting with excitement already, Fluttershy smiled seductively before saying "Yeah... you like that boy?" Spike simply nodded rapidly as his cock started to emerge, getting longer and thicker with every passing moment. Fluttershy moved her hand away from his balls and started stroking his cock, continuing her dirty talk, she said "Does that feel nice? You wanna put this naughty dog dick in my wet little pussy?" Spike didn't respond this time, he was just enjoying Fluttershy's touch and getting immeasurably horny.

Fluttershy smirked, she could feel that Spike was as erect as he could possibly get, so she turned around, pulled down her skirt and panties, then leaned her front half on the toilet, ready for Spike to fuck her. Spike was spurred into action and quickly draped himself over Fluttershy's butt, pressing his paws into his hips as he searched for Fluttershy's pussy. Fluttershy giggled as Spike had trouble with his aim, he was either slipping in between Fluttershy's thighs or wedging his cock in her ass crack, Fluttershy reached a hand back and took hold of his cock, pressing the head right up against her slippery entrance. Finally in the right spot, Spike immediately penetrated her and they both let out a groan of satisfaction, Spike said "Wow... this feels... fucking amazing..." they were both silent for a minute, then Fluttershy let out a small yelp as Spike started to pound her as hard and as fast as he could, his little doggy hips clapping up against her jiggling butt.

Fluttershy was moaning, she had always imagined how it might feel to get fucked by a dog, but her fantasies did not compare the real raw feeling of a dog furiously humping away at her pussy. Spike was working on primal instinct, he was almost aggressively fucking her as if he was angry that he couldn't just fucking ram this bitch harder and force her into submission. Fluttershy screamed into the sleeve of her shirt as she came, the exquisite feeling of actually being fucked by a dog overwhelming her body and making her pussy squeeze Spike's cock, desperately trying to milk an ejaculation out of him. As Spike's knot started to grow he found it more and more difficult to push inside Fluttershy's pussy, until it grew to a point where Spike had only just managed to push back in, but was now unable to pull out. The quivering warm walls of Fluttershy's pussy made him groan, his claws digging into Fluttershy's skin, her body sweaty and exhausted from such a powerful orgasm, they were both panting heavily.

Spike continued giving small humps into Fluttershy's pussy and eventually his knot started to deflate just as he blew his hot sticky load inside her, Fluttershy moaned in satisfaction as she felt Spike's spunk fill her with warmth, gently rubbing her stomach as she felt it sloshing around in her moist cavernous cunt. Spike, having shrunk back to a decent size tugged and pulled his cock out of Fluttershy's pussy "Wow..." he said "That was amazing!"

Fluttershy giggled as she stood up, putting her skirt and panties back on, not particularly caring if her panties ended up soaked with pussy fluids and dog cum. "I'm glad you liked it, thank you Spike".

The End

Author's Note

Thank you Undead Man for this story idea! I hope you liked it! :)