Melissa had locked herself in her bedroom, her face red with tears and anger. She thought what she had with Erika was special, but earlier today she had caught her big brother ramming his dick into Erika's pussy. It it's not like it was the first time - during the recent sleepovers with her friends, she found out that Erika had slipped out of the bedroom to suck Cole's dick! Maybe she was a slut after all; Cole did say Erika came onto him, and she was starting to believe it...
But she had lost her friend, or girlfriend, and now Melissa was all alone to deal with her "situation". Anyway it was not like she could tell Erika that her dog Max has impregnated her!
At least that's was Melissa's train of thought as she recalled the recent events and the sleepover - she was totally oblivious of the fact that it was Erika that had put her knot into her while in her canine form! She had convinced herself with the more logical explanation instead, that the dog creature that had fucked her was Erika's husky Max, that he had slipped into the bedroom in the dark. She felt guilty of the pleasure the dog cock had made her feel, because in spite of that she had only been into girls. And now, not only was her belly and breasts growing, but at an alarming rate! This was too strange to tell anyone...
She sat on her bed, pushing away the blanket she had been curled up under for the past few hours, to look at her belly. It was so big now, the smooth skin stretching in what would be a perfectly round dome if it were not for the swelling teats poking out, slowing rising as the underneath filled with milk. The gravity pulling them down made it look like she had several pairs of human breasts, from small on her tummies to large on her painful chest.
She tentatively grabbed her original, upper breasts to weight them, and let out a small yelp as milk squirted out with no warning.
"Not again!" she grunted, before shoving one nipple in her mouth and suckling. The pain subsided almost immediately, replaced by tingles of pleasure. Gulping down the liquid more and more hungrily, she eventually switched to her other upper breast, licking the milk from the areola and then sucking again, letting out little moans of contentment.
Melissa was getting lost in the moment when a strange sensation ran through her spine. She was feeling extremely hot, and removed her open shirt to then squirm out of her school skirt. Her hips cracked, getting wider, while her belly pushed forward again. She thought she was about to throw up, and stumbled naked out of her room to the bathroom, holding her huge belly in her hands.
Fortunately no one saw her in the corridor and she locked herself in the bathroom. Another strange electric surge of pain and pleasure went through her body and she fell on all four, heaving, arching her back under the weight of her full belly getting bigger and bigger. Her swollen breasts jiggled and dangled, seemingly growing as well, the nipple-teats looking longer and fatter.
At this point Melissa was feeling too dizzy to really think. She was running only on urges and impulses, high on hormones, hooked on endorphins that were numbing the pain. She crawled to the bathroom carpet and laid on her side, her belly heaving with each breath and her crotch on fire. She was about to give birth to her puppies.
Her belly and sex contracted, pushing out her first ever litter. One by one, four little ones got out, and she let them crawl to her teats and suckle on her voraciously as she passed out, the remnants of amniotic fluids spilling between her legs on the carpet.