Whoa Nelly had been walking around shops in Canterlot all day, and needed a place to sit for a rest. So she found a quiet spot, and plopped her self down with a woof. Startled she looked down to realize the spot wasn’t actually vacant, a diamond dog was napping there, and was now struggling under her, grunting and wheezing from the weight. “Oh!” Nelly struggled to get back up, the dog gasping and coughing when she finally managed top stand again.  
“Sorry! I’m so sorry, I didn’t see you there!” Nelly apologized, feeling incredibly embarrassed, her limbs a bit sore from getting up so quickly.  
“Guh, that’s okay, don’t worry about it” The dog blinked as he recovered from just being crushed.  
“I-I can’t believe I sat on you! I’m sorry, I’m such an idiot!” Nelly felt that she could kick herself for making such a bonehead move.  
“No, no, it’s fine!” the diamond dog reassured the mare, seeing that she was beating herself up over her little mistake, “Seriously, don’t worry about it. I don’t mind being sat on, hehe.” He smiled up at her, comfortingly.  
“Y-you don’t mind?” Nelly blinked in surprise.  
“Nah, it’s fine, really” The dog reassured again, dusting himself off.  
“Oh… well… can I sit back down then?” Nelly asked, blushing a bit.  
The dog looked up at her in surprise, “Wh- you wanna sit back down on me?”  
“You said you didn’t mind” Nelly said, still looming over the dog.  
“Wel-bu-I-uh…” the dog blushed deeply, “… o-okay?”  
Nelly let out a soft giggle, and slowly sat herself back down on the cute dog, who let out a heavy wheeze as he took back on her weight. As her embarrassment and shock from her mistake faded away, Nelly became re-aware of just how tired her muscles were, especially after scrambling to stand like she did, and was very grateful to be able to be able to sit again, and give her muscles a nice long rest. The diamond dog was making the most adorable sounds she had ever heard, with his little gasps, coughs and wheezes, though he didn’t struggle… much, and she found that she loved the feeling of him being under her, as well as knowing his body was being strained from the weight.  
Nelly hoped that her new doggy friend realized just what he got himself into, because she didn’t feel like getting up for quite some time now…
 
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Yeah, I suck at writing, shut up! XP
 
I’ll probably color this eventually ^^