Chapter 5 Yona's Dress Yields

“Darling I'm so pleased you agreed to assist me today.” Rarity grinned as she levitated her measuring tape over to Yona as she stood on a white pedestal in Rarity's classroom.

“Yona always happy to help Professor Rarity try on clothes.”

“I'm delighted to hear that.” Rarity brought a hand to her chin. “Are you completely sure that you have nothing else to do today? I swear I remember Rainbow dash saying there was cheer leading practice today?”

Yona grinned. “Yona sure that there not cheer leading practice today. Either way Yona feel that trying out Professor Rarity's new clothing more important.”

“OK then.” Rarity took a deep breath. “Let's make sure I remember your proportions dear.” Rarity levitated her measuring tape and extended it from Yona's head on down. “OK six foot five.” She then slung the tape around her midsection followed by the farthest point her boobs stretched out. “and you're still an E cup.” Rarity grinned. “Although I must say that on your frame that E cup looks exquisite.” Yona blushed and grinned as Rarity measured her ass. “Mhm you're exactly the same size you always are... give or take an inch or two. Ok then let me get the first ensemble.” She turned around and headed towards a wooden chest in the back of the classroom. While Rarity was busy, sorting through the outfits Yona clutched at her breasts as the weird sensation from earlier gripped her chest. Rarity turned back around and tilted her head. “Is something the matter dear?”

“It nothing professor. Silverstream grew flower for her magic report and it sprayed Yona and friends with pollen. Yona been having allergic reaction to flower all day.”

“Oh”, Rarity chuckled. “Reminds me of the time Twilight brought in a magic fern to examine.”

Yona cocked an eyebrow. “What happen?”

Rarity giggled. “Let's just say I learned a lot about coordinating green fur with my dresses that day. Now then here's your first dress.” Rarity handed Yona a long flowing white dress with gold trim on it. Yona grinned as she snatched the dress out of Rarity's hands. She slipped off the brown dress she was wearing and put the white dress on.

“Yona like dress.” She twirled around with a grin.

“You look fabulous darling. I based that design on Silverstream's wardrobe. She always has such nice formal togas.”

“Did professor Rarity base dress on Yak outfits?

Rarity grinned. “Of course.” She turned around and sorted through her box again. As she was doing so however, Yona felt her chest starting to strain against the dress. Rarity pulled out a brown top adorned with several teal patterns around the selves and a pair of brown pants with a similar pattern. “How's this look darling?”

Yona clapped. “Yona like. Can I try it on?”

“It goes without saying.” Rarity handed Yona the dress and went back to sorting through the clothes in the box. Yona slid the white dress off and put the top on. The top strained extremely hard against her chest, but she managed to slip it on regardless. Next she went for the pants. Once she slid the pants up to her butt she found that the pants just didn't fit. Yona yanked and pulled at the pants in the vain hope that it would somehow pass the insurmountable barrier of her ass. Unfortunately, all her efforts amounted to nothing.

“Umm Professor Rarity. Yona having trouble with pants.”

“That's odd.” Rarity looked up from her rummaging. “I could swear I made those to your exact proportions.”

“It not just pants. Top feels tight too.”

Rarity hmmed as she brought a hand to her chin. She got her measuring tape out and measured Yona again. “I must be off my game today. You're a little... fuller than I remember.”

“Does that mean Yona fat?” Yona frowned.

Rarity just chuckled. “Nonsense darling. It simply means I need to remeasure.”

Yona sighed. “Yona hoping that outfit would fit. Yona like outfit.”

Rarity grinned. “Not to worry darling, I'm a professional. Now that I've got your proper measurements, it'll be a quick fix.”

Yona smiled and slid the ill fitting clothes back off before putting her original outfit back on. However Yona felt continued tightness in her chest despite being back in her regular outfit. Rarity meanwhile went over to her sewing machine and started to snip and cut at the pants and top she made. “So Yona have you been doing any good smashing lately?”

Yona sighed. “The smashing hasn't been going too well lately.”

“Aww I'm sorry to hear that darling. Wanna talk about it?”

“Ok.” Yona nodded. 

“So what seems to be the problem?”

“So, Yona has been smashing with Sandbar for a long time. We smash a lot together.”

“I'm glad you can include your friends in your smashing.” Rarity grinned.

“How could I not? Smashing lots of fun especially with Sandbar but for past few weeks smashing has been dull and boring. I know Sandbar trying but no matter what Yona not enjoy smashing with Sandbar lately.”

“Well maybe you can include other students in your smashing sessions.”

Yona shook her head. “Yona not sure that work. Gallus watch us smash once, but it just ruined smashing mood.”

“What about Smolder? I know she loves smashing stuff.”

“Smolder too insecure to smash with us. She also have weird cloaca instead of proper vagina.”

Rarity stopped sewing as her eyes went wide. “Oh...” She chuckled nervously. “I apologize I misunderstood. I thought you were being... how you say... more literal.”

“So Rarity not wanna talk about smash anymore?”

Rarity chuckled. “I don't mind Yona. I'm always eager to help in the pursuit of love.”

“So.” Yona sighed. “What can Yona do to get Sandbar good at smashing?"

“I'd say a good way to start would be a new outfit. Stallions love it when they see their marefriends in a new dress.”

Yona nodded. “Yona agree. New outfit will surely arouse Sandbar enough to smash better.” The moment Yona said that however, a harsh ripping noise filled the room. She looked down just in time to see a huge tear forming in her top. Both Rarity and Yona stared dumbfounded as the tear grew until with a final rip Yona's boobs popped right out of her ruined dress.

“What going on? That dress fit Yona ever since mother pass dress onto her.” A tear formed in Yona's eyes.

Rarity quickly walked over to Yona and put a hand on her shoulder. “It's ok darling; I'll fix it up for you.” Rarity squealed, however, when she saw Yona's boobs oscillate and expand a bit. “Oh my stars!Yona your breasts.”

“What about Yona's breasts?” Yona tilted her head.

In a panic, Rarity levitated her measuring tape over and measured Yona's bust again. “Yona... your breasts are getting larger.”

Yona's eyes went wide. “larger? What do you mean larger?”

“Ever since I measured you earlier your cup size has jumped by two cups.”

“That silly, breasts don't just grow. See.” Yona stared intensely at her boobs for a few minutes until they oscillated again and gained a bit more size. “What going on! Why Yona boobs growing?!”

“I don't know darling.” Rarity wiped some sweat from her brow. “Wait, you said earlier the flower Silverstream grew was giving you an allergic reaction?” Yona nodded. “Well seems pretty clear then. Are your boobs still feeling weird?”

She nodded again. “What can Yona do?”

Rarity sighed. “Well you can go to the nurse's office.”

Yona looked down with a blush. “But Yona would have to go out in hallway naked. Yona doesn't want that.”

“Not to worry.” She grinned. “We'll simply wait out the expansion here and when it's all done I'll make you a new outfit.”

Yona smiled. “Yona like that.” She paused. “Yona's panties also feeling tight. I think Yona's behind expanding too.” Carefully Yona slid her dress ruined dress off revealing that her bra and panties were both indeed sinking deep into her woolly flesh. Several minutes of expansion latter Yona felt the clasp of her bra pop off leaving her boobs bouncing around as they continued their growth.

“You might wanna take those off before they get ruined.” Reluctantly Yona slid her bra and panties off as Rarity instructed. Yona blushed at her nudity as the abnormal sensation from the flower and Yona's expanding body continued. Several minutes later Yona felt the sensation die down as her breasts thighs and ass stopped expanding. “Yona think expansion over.” she looked down at her massive boobs. Where once her breasts seemed pretty proportional to the rest of her body they now dominated her entire upper half. Her ass and thighs meanwhile had grown so much she had gained a pear shaped body.

Rarity stared at Yona's body for several minutes before nodding. “I think so too.” Rarity got out her measuring tape again and started measuring Yona again.

“Does professor think Yona look weird?” Yona frowned.

Rarity finished measuring her bust. “Nonsense darling. You still look gorgeous. Now just wait there a bit while Rarity whips up an outfit that will make you look glamorous.”