As the girl picked up her bags, the symbiote gathered information about her.

"Her name is Ssssally...sssshe is lonely and hassss no friendsss... interessssting..." The symbiote thought as Sally got into the elevator to her apartment.

"She livesss with her abusssive father..." The symbiote realized that it could use this to bubble up emotions to feed on. However, it realized that she would need more convincing. 

Sally snuck into her room and dropped all her bags. As she was taking off her shoes while she lied on the bed, the symbiote pounced, crawling up her leg.

"Ahh!" The confused Sally yelled as she felt something gooey on her leg that was moving. She reached down and felt the slippery latex. Before she could yell for help, the symbiote had encased her right leg and began moving to the left. As it did, it came across Sally's crotch. Crawling down her pants and reaching her vagina as Sally gazed at the scene, more than a little aroused. The symbiote, unfamiliar with the differences between men and women, covered her vagina like normal. Sally moaned as she reached down and felt the slime.

The symbiote then proceeded to flow down her other leg and cover it turning her feet into claws. While the symbiote was focused elsewhere, Sally gave a small rub to her covered vagina and moaned again. The symbiote received a large flow of emotions, mainly happiness and decided to keep Sally on her high. The symbiote then proceeded to rise and slap down onto her breasts causing her to fall down on to the floor as she breathed heavily. By now, rejuvenated with energy, the symbiote readied itself as it dove down into her mouth. While the symbiote crawled down her throat, it plunged in through her vagina  along with her ass. She moaned in pleasure over and over as it went deeper and deeper, encasing it along the way.

"What are you!? Oh!" She managed to get out.

"Sssally...we are a sssymbiote...bond with usss... ssspread the raccce..." the symbiote whispered into her head. As it did, it tickled and played with her clitoris.

"yes...Yes...YES!!" SHe yelled out as she dove for her vagina and began massaging it before quickly fingering it. As cum drizzled out, the symbiote met up and completed it's bonding.

Sally was now in a black costume with a white spider splayed across her chest. Her head now had a huge gaping mouth full of sharp teeth and a footlong tongue.

"Now what ssshall we do...?" The bonded Sally said as she finished masturbating. The symbiote reabsorbed all that cum and relished in the large amount of emotions.