Blaise'd gone over to meet your friend, Jen, a However, the only person home was her 22 year old sister, Cindy.
Blaise thanked her for her time and prepared to leave...
"Wait," she said, reaching out the front door and grabbing your arm. "You might not be able to hang out with my stuffy, boring younger sister, but you can hang with me. I'm a bit lonely at the moment so would welcome the company," she smiled, a small blush on her cheeks. Cindy had always had a crush on you.
Blaise thought about it. Cindy could be a bit... much. She was much more outgoing compared to you and her sister and extremely hungry for attention. She would often snuggle her way onto your lap while you and your friend were gaming, causing you to lose. But, she was also sweet and kind and not usually malicious, just a bit unaware.
Blaise didn't have anything planned so decided to agree...
"Great!" Cindy cheered. She pulled you through door with excitement. She took you to the couch. "Just wait there a minute, I've got to get some cookies out the oven."
As she ran off, you sat on the couch...
Then you felt a strange sensation. Within moments you body shrunk down to about 4 inches tall. Blaise looked around, panicking. You tried to call Nova for help but she was still in the kitchen currently tasting her homemade cookies. You don't know what to do...
"Hey, Blaise! You've gotta try these cookies, they're amaz- huh? Where did you go?" Cindy asked as she entered the room. Blaise started to scream for her but she didn't hear you. She walked over to the couch, her blue shorts and ass hovering above you. Clearly she hadn't noticed you below her. Blaise continued to shout but she was totally unaware. "Huh, maybe they went to the bathroom or something?" Cindy shrugged. The giantess started to lower her ass to sit down...
BAM! SMOTHER!
Cindy sat on Blaise. Her ass covered you, your body fitting nicely in the groove of her butt crack which disguised your size under her ass. She let out a, "humph," as she bounced and wiggled to get comfy, angrily pondering why her parents bought such a lumpy couch. Fortunately, the shrinking made you invincible or else she would have crushed you right there and then. Though, you can still feel pain and at this size it feels like she weighs a lot, at least her ass was squishy so it was completely crushing...
Cindy reached over to the plate and grabbed a cookie. She started to munch. "Where are they?! I didn't spend all morning cooking these for them to fuck off the moment they arrive. We were meant to spend a cute afternoon together!" she sighed, crunching her cookie. Then, she felt a gurgle in her stomach. "Damnit! Of course I need to fart. Maybe I shouldn't have eat so many of these in the kitchen, oopsie. Well, *looks around* Blaise isn't here, perhaps it would be ok if I-," she thought to herself.
You felt Cindy move a little, you hoped she had noticed you and was going to get up...
Bbbbbbbbbrrrrrrraaaaaaappppppttttttt
Cindy unleashed a powerful, grumbling fart. Her gas made you and the couch vibrate. The smell was awful... rancid and disgusting. You coughed as you smell and taste the disgusting gas, your body forcing you to gasp in the putrid air.
"Heh heh, oopsie, that was a little loud. And *sniff* *sniff*- arh! That smells so bad! I hope Blaise doesn't notice when they get back," Cindy said as she waved a subtle hand behind her ass.
You screamed for her to notice. You started to squirm as the horrible gas filled your body making you feel sick beyond comprehension...
"Why is-? What is that?! I hate this stupid couch so much-," Cindy complained, feeling the lumpy couch moving. She stood up and angrily looking down before gasping with horror, "OH MY GOSH! Blaise?! I- is that you?!" She got on her knees and brought her face close to you. "What happened?! A- are you ok? Wait, was I sitting on you?" she asked while checking you're alive. Then, she had a horrifying realisation. "Does that mean I-?! Oh gosh, I'm so so so sorry, I didn't mean to fart on you! It- it was an accident, I swear!"
You gasped for fresh air as Cindy scoops you up in her hands. She sat herself down, making sure to check her seat this time. She looked at your tiny body. "How did this happen?" she wondered.
Cindy let you rest after the ordeal that was her ass...
"Are you ok? I'm so sorry, I should have been more careful. You just don't expect to find a tiny person on your seat, y'know. I hope you can forgive me," Cindy said, checking you over. "A- and, I'm sorry again about farting. I- um-, I thought I was alone, I'm not gross like my sister, I promise, I barely ever fart in fact." You knew that last part was a complete lie, you'd stayed over enough nights and had her force her way into snuggling with you during movies only to fall asleep and unconsciously fart until she woke up a few hours later. Plus, you'd used the bathroom after her, she could be plenty gross. But you didn't normally mind, though being farted on by a giantess was a bit tougher to handle than brushing your teeth in a smelly bathroom.