Suggested by SoI'llKillYou:

Blue diamond sees the crystal gems shapeshifting for fun. After Steven encourages her, she tries it. Hilarity ensues.

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Blue diamond had been watching the crystal gems for a while. They were currently changing their forms to show them how fun it could be. Yellow offered to permanently alter their forms, but they declined.

After a while, Blue slowly started to think about changing her own form. There were a few things she'd love to change.

She thought about how different she would make herself. Should she change her hair? No, she wouldn't look as good as Yellow or White do with their hair. Maybe she could change her outfit? But she liked her dress.

There was something that she had that her fellow diamonds didn't. Her form was much smoother, and curvier than theirs were. Maybe she could show that off.

When there was a quiet moment, she spoke. "Yellow. I would like you to use you ability on me. I'm curious. Maybe I could change my form for a while."

Yellow nodded at her. "Very well Blue. What would you like?"

At that, Blue looked down. "Well, maybe this is not a good idea. I am not sure how my new appearance would look to the gems."

Steven smiled widely. "I'm sure it will be fine, Blue! If you're happy with your form, that's what matters! Give it a try, I'm sure it will be great."

She hummed softly, thinking it over. After a few minutes she nodded. "Thank you, Steven. I believe I will like it."

Yellow nodded. "Yes, Blue. Now what would you like?"

Blue diamond smiled at Yellow. "I'd like my hips bigger."

After a few seconds, Yellow nodded, and rubbed her hands together. As static formed, she aimed it at Blue.

When the static hit her, she could feel her hips widening. Her gown raised just a little. Once it was done, Blue admired her new form. She felt different in a good way.

A pleased hum escaped her, and she started to sashay her hips side to side. "This is perfect! Thank you Yellow. I...Yellow?"

The yellow gem was gawking at her, and she shook her head quickly. "Ah... ahem, yes. I am glad you like it. What are you going to do?"

At that, Blue hummed slightly. "I believe I will go for a walk. I need to get used to my new form."

When she turned, and sauntered away, Yellow gawked at her again. Pearl was blushing bright blue. Garnet was grinning slightly. Amethyst was laughing. Finally, Steven gawked slightly too, and felt his face go hot.

As Blue walked through the area, she kept bumping against the door frames. That would take time to getting used to.

When she walked down the steps to the palace, her butt bumped against a few potted plants.

As they fell, and the pots shattered, Blue sighed. "I hope nobody will mind."

She heard a gasp, and looked to the side. There was a Jasper looking at the broken pots sadly. Her eyes looked up, and she gawked at Blue.

The Jasper quickly gathered the broken pots. "Ah...hello. Blue diamond. You look...radiant...today."

Blue smiled slightly. "Thank you. Were those your flowers? I'm sorry. I can help you."

As she bent down to help scoop the dirt up, she felt another group of pots bump against her, and fall.

When those shattered, she frowned. "Oh my..."

The Jasper spoke quickly. "It's ok. I can fix this. Would you like to...continue your walk?"

She nodded, and gave the jasper another smile. "Yes. Thank you."

When she started to walk off, she noticed many gems looking at her. Well, not at her. They were looking at her hips.

Blue kept walking, feeling strange about so many gems gawking at her. She noticed her Pearl strolling.

Blue pearl saw her, and gasped.

Her face went dark blue. "H-hello Blue. Your form is...different."

A soft laugh escaped her. "Do you like it? I thought I'd do something different."

She spun in place, her gown flowing.

Blue Pearl let out a squeak, moving out of the way. "Oops! I suppose I need more practice."

After a few minutes of walking, Blue returned to the palace. Yellow spoke quickly. "Ah! Blue...how was your...walk?"

She smiled. "Nice...strange. I need practice in this form."

Yellow nodded. "I'm sure. Maybe I will change my form as well."

Steven smiled at them. "Maybe all of you should! It could be fun!"

Blue smiled at him. "It would be. Just be careful."

Yellow nodded again. "That seems...logical. I'm glad to see you happy."

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Blue is thicc.