Katy had gotten a promise out of Kal that he wasn't to tell anyone about her sexual experiments. Kal was her stepbrother, they had fucked and fooled around once, so what? No one else needed to know and she could deny it. Katy thought that was the end of it. As she headed back to Sugar Loaf she felt tired and slow witted. She saw her doc and he told her that it might be low iron. So she took some vitamins to compensate for an iron deficiency but it didn't stop there. Back in the college dorm as she was preparing for class when she felt an urge to throw up. She spent the next 10 minuets vomiting, which was not sexy at all. Her hair thrown over her shoulder to avoid ruining her looks any more.
Again the campus doctor thought that it was just a stomach bug, she was on the pill, so she must have just been sick. She was young and strong and the body fights off most infections. But after a week she didn't feel better and her breasts were starting to feel sore and tender. Katy went to the campus doctor and he was gone. A visiting Asian female doctor sat her down and took some blood tests. Soon the nurse came in.
"Congrats you're pregnant."
"What the fuck?" Katy blinked slowly.
The nurse was an African woman, literally from Africa with an accent, who realized that this news wasn't being received. So she called Dr Wong back in. The doctor explained to her that she had a hormone that indicated that she was pregnant. Some six weeks now, this hormone is what the drug store pregnancy kits relied on reacting to. Katy got quite upset and shouted that she was on the pill. The Doc explained patiently that the pill was not fool proof. No system was, that's why the pill should always be combined with other forms of protection. She commented on these things because they didn't affect her, she didn't write a prescription for this student's birth control nor had she given the advice.
"So your partner, was he wearing protection about six weeks ago?"
Katy sobbed, that was the other thing her emotions were going up and down like a yo yo. No Kal hadn't been wearing a condom because as far as she knew they didn't make them for dogs, or people stuck half way between a bitch and a woman. It was just once, you couldn't get pregnant the first time could you? Plus she had been a dog, mostly when Kal dumped his load.
"Did the man you have sex with ejaculate?" Dr Wong asked.
The flashbacks hit Katy. Kal letting go of her skirt and unbuttonned shirts to play with her breasts. As her nipples rubbed against Kal's hairy chest, they hardened in the colder air. She also remembered now seeing three rows of teats that had appeared on her belly.
Kal letting out a low growl. His dick was turning a deep red and more canine in appearance, throbbing against her moistening pussy. Katy's hips bucking in response and she pressed herself on Kal's length without even realizing it. In an instant, she engulfed his whole cock in her pussy.
Delicious waves of pleasure buzzed from their connected parts. Her quiet moaning, unable to stay perfectly quiet as Katy rammed herself on Kal dick harder and harder. Kal mounting her tightly again as she felt something swell at the base of his penis - a canine knot, locking them in pure bliss.
"K-Katy", he'd moaned, "it's... it's gonna blow soon..." he growled. Between his hind legs, the two swollen orbs were churning intensely and drew closer to his body.
Still sitting on top of his sister, dodgy style, Katy too felt her insides clench as she was about to climax. One last time she rammed herself around Kal knot, and the first geyser of cum exploded deep inside her. Kal had quickly put his hand over Katy's mouth to muffle the lewd moans she was making, clenching her own teeth to keep from howling of pleasure.
The chaotic bucking faded to a mechanical spasming as Kal emptied herself in Katy, the thick canine cum overflowing Kal's lower belly and pooling under the two lovers.