A lovely digital paint commission by the equally lovely  punkcrowley / CaramelBun!!

I've been aching for kinky Charasriel content for ages, and her style is so soft and cute I couldn't resist!

While it was being worked on, I wrote a short drabble inspired by it. I hope y'all enjoy it!
(For reference; my Chara is nonbinary/transfemme and uses both she/her and they/them. My pieces with these two on AO3 use both~)

---

Chara's stocking-foot stomped rhythmically on their footpump's bellow, her brother's already-taut blimp of a belly growing larger and larger with each step. She grasped the goat's body, laying her head atop the balloon boy and sinking her body into his plush fur.

Asriel's skin was soft on the surface, but quickly became firm under an overwhelming pressure inside the boy. His face was beat-red, he felt himself growing tighter and tighter, gripping at his balloon-like hide with a paw. He wiggled and moaned, the tension overwhelming his nerves. He didn't dare let go without his sibling's permission, however.

In response to Asriel's whimpering, Chara merely flattened her hand, gently petting the goat. "Shhhh, it's okay," she spoke, in just above a whisper. "You're OK. I've got you."

Asriel inhaled firmly, closing his eyes, before letting it go in a cathartic huff. He moved his paw closer to Chara's right hand, and despite the boy's immense volume and tenuous pressure, the two managed to clasp fingers as Chara turned her head to rest her ear on her brother's middle, listening to the "fshhh" of air rushing into Asriel as she pumped.

He was still nervous about being blown up like this, but Asriel couldn't deny that Chara made him feel capable, like he was doing really well. He glanced over to where his sweater had torn from the air spreading around his body, fattening his body up into a caricature. He was sad for a moment, then figured that the two of them would fix it together later.

Just like they always did.