Sketchbook #1 (Sketch #77) - Rarity and Spyke (Patreon)

I posted a preview of the 1st digital roughdraft on Furaffinity. Here's the 2nd before it goes there. I'll just paste the story here as well. 

Background isn't mine, just a placeholder for when I decide to do an official one. 

 If someone could die of embarrassment, I’m sure I’d be first. It’ll be a long time before I let Twilight try a spell like this again.

The purple dragon was shaken from their thoughts by the white mare in front of them. Rarity stifled a laugh as she excused herself and disappeared around the corner, out of the young dragon’s sight. She had taken the dragon’s measurements and must have found Spyke’s awkwardness amusing. Spyke blushed and sat on the small stool Rarity had asked her to use, or at least she tried to sit. This was all so new to Spyke still, being a girl that is. Spyke was having some difficulty trying to adjust to her new proportions, mostly her rear and her chest being the major problems but not where the list ended. The stool was so small now that Spyke feared it somehow becoming engulfed and lodged in between her cheeks. The thought alone sent an odd shiver up her spine that she tried to ignore.

She adjusted time and time again while Twilight’s panties seemed to dig deeper into Spyke’s hips. Rarity had been gone for some time now, but the dragon kept her gaze downward and fiddled with her tail absentmindedly. The soft fabric wrapping around her nethers was a foreign experience that Spyke wasn’t all that averse to. They're actually really comfy. Twilight felt terrible for what she had inadvertently done. The alicorn had been kind enough to let her borrow her panties but nothing else in her wardrobe would even come close to covering up Spyke’s now curvaceous body. Though there wasn’t much chance that Twilight would ever be able to use that wardrobe again herself. Which was why Spyke was in Carousel Boutique waiting on a certain enchanting seamstress in only a pair of borrowed panties. Spyke was just thankful she didn’t have to walk here. That’d be a nightmare. Strolling through Ponyville almost stark naked with a body that I would have drooled over a few days ago.

Twilight and Spyke were transformed by a spell with changes that seemed to be chosen at random. Although Twilight didn’t believe in random chance, she was just at loss for why they had been changed so… aggressively. While she was back at the castle trying to decipher the enigma that was this new spell, she had teleported Spyke to Rarity’s boutique so she could shield Spyke from the leering looks of the townsfolk. When Spyke entered, it dawned on her that they weren’t the only ones to suffer some form of “side effect”. Which was why Spike kept her eyes locked on her own heaving bust and what little she could see of the floor beyond her now thick thighs. Rarity had certainly been affected as well, and Spyke was trying her best to ignore it. Just seeing it made her feel strange and a little uncomfortable with her own thoughts. Just thinking about it had left a dull ache and a feeling of wetness between her legs.

Yep, better to keep my eyes trained on the ground rather than stare gawking at her… What’s that smell? There was a smell in the air that Spyke couldn’t place. She had smelled it before but never this strong. It made her head spin but at the same time sent her heart beating faster. Spyke suddenly perked up in her seat as she heard the soft clacking of Rarity’s returning hoof steps on the floor behind her. She hoped Rarity wouldn’t ask her to stand, she’d no doubt notice the wet spot left on her seat or the sticky juices plastering Spyke’s inner thighs.

Rarity placed her hand on the purple dragon’s head and smiled to herself as the dragon relaxed at her touch. “Don’t worry, darling. I found just the thing for my little Spikey Wikey.” Though certainly not so little anymore, she thought. 

Her eyes flitted to the growing pillar of flesh unsheathing from in between her legs. She was thankful the dragon didn’t motion to look at her and she knew why she hadn't. Always so respectful, you really are sweet Spyke but my intentions for you today can hardly be described as such now. 

Rarity could feel the behemoth she now called her cock reach full mast and bit back a moan as a thick bead of precum welled at her tip. She gently rubbed her fingers over Spyke’s scales. “It’ll fit like a glove and I’m sure you’ll just fall in love with it.” 

Her smile grew into a predatory grin as Spike finally turned to face her. 

“Thanks Rarity, I-” Spyke lost all train of thought when her eyes fell on the massive horse cock jutting from her friend’s crotch.