Slime/goo

Rarity was in a cave searching for gems. She had been searching for around four hours. She pulled her phone out while taking a little break. She had no signal down their. She put her phone away and continued deeper into the cave. After another two hours she decided to set up camp at an underground lake. She shrugged off her backpack and took out the essentials. A sleepingbag and other stuff. Her dinner was a couple of energy bars and water. After that she got undressed and got in the sleeping bag after setting an alarm on her phone. Unknown to Rarity when she had been by the lake and left her sleeping bag unattended a slime creature had gotten in her sleeping bag and had soaked into the lining. While Rarity was asleep the slime saw the perfect time to get a host. It started to coat Rarities legs and crawl towards her vagina. Fortunately for the slime Rarity was a very heavy sleeper. It finally reached the vagina and started to enter Rarity. 1/4 of the slime had entered Rarity when it reached her cervix. The slime started to release chemicals that would make Rarity very horny and keep her from waking up for a couple of hours and also softened her cervix. The slime then started to push the cervix apart. After getting a good enough opening the slime then started to fil Rarities womb. It flowed up into her horns and filling the rest of the womb. It was only halfway in her before it started inflating Rarity. In her sleep Rarity unzipped her sleeping bag down to right below her waist. Her belly now has the appearance of being 6 months along.