Image imported from derpibooru
Original Description:

“I have an idea!” Spike exclaimed.
“What is it?” Thorax asked.
“Thorax, YOU could have our kid!”
Thorax became flustered, his face growing red. “Wh-wh-what?! Whaddya mean?”
“You could turn into a female dragon and carry the egg for us!”
AJ said, “That makes sense!”
Thorax turned redder and started stammering. “i-i-I don’t know about this, guys, it doesn’t — I mean, I think — what I’m trying to say is —”
Ember looked at him teasingly. “Don’t you wanna help your friend? Or are you just too afraid that you won’t be able to handle it?”
“n-n-n-No, it’s just — I mean, I —”
Thorax stopped speaking when he saw Spike, who was making the saddest puppy eyes he’d ever seen. “Please, Thorax?” he whimpered.
Cut to 1 week later…
There was a knock on the door of Ember’s cave. She opened the door and immediately started sniveling. There stood Thorax, who was transformed into a colorful dragoness, and was also slightly pregnant.
“You all owe me BIG TIME.” he (or is that ‘she’?) said, blushing.
“Okay… Therma!” Ember snickered at the nickname she’d just come up with.
The newly renamed Therma blushed even harder.

I’ve gotten a lot better at drawing, can’t you tell?