"Alright then... How about... You get naked and sit there for the rest of the game."
Impossible. "I... I'm not comfortable with that."
"Come on Erika! We did all those silly dares, it's your turn now!"
Erika gulped. This could only go wrong, she was certain of it. She grabbed the bottle and chugged down whatever was left in the bottle. Fortunately it wasn't too much, but she was already a bit intoxicated.
"Game's over now, bottle's empty" she said with a hiccup as she put the bottle down. "I'm tired of playing" she added, before pushing away Emily's hand and climbing on Melissa's bed to slip under the cover of the duvet.
"No need for sulking, killjoy." Piper said with a pout. "Alright, it's getting late and the vodka is making me sleepy too..." she added nervously.
All the girls went on to brush their teeth and get set for the night. Our quiet Erika laid under the duvet on her belly, waiting for the lights to turn off. She couldn't help squirming, her painful groin swelling under all the medical tape that had kept her package in check.
She was leaking so much pre that the tape had come loose and her erection was slipping out, creeping up her belly.
"Ok, turning off the lights now! Night-night!" Melissa said when Emily, Piper and Riley were settled down on the mattresses. She then climbed on the bed and crawled under the duvet, and removed her nightgown to spoon Erika from behind. Slipping a hand over Erika's left breast, she started discreetly gropping her under the bedsheets.
Erika tensed up a bit and pressed her hardening member against the mattress as Melissa's nipples brushed against her back. She felt light-headed, her body intoxicated from the alcohol and Melissa's touch, but also terrified Melissa could uncover her secret. The fur from her thighs was spreading down her legs, and all her canine teats were out. She could feel her ears getting pointier and canine teeth in her mouth.
Fortunately Melissa was too wasted to last long. After a few minutes of squirming against Erika, she passed out. Erika laid still, waiting for everybody's breath to become slow and regular, so she could get up and take care of her problem in the bathroom. Jerking off was the only way to reverse the transformation, even if it was only a temporary fix...
Erika's eyes were becoming able to see in the dark. As she was preparing herself mentally to get up, she spotted movement on the other side of the bedroom - the blankets were slightly shifting. As she listened, she could hear wet sounds and soft whimpers.
Piper and Riley were making out in the dark. Everybody else seemed asleep, but Erika's increasingly canine eyesight could spot the two best friends as they kissed and pushed away their blankets with all their squirming. Riley was on top of her friend and fondling her beasts, her dark hands contrasting with Piper's pale skin.
A wild throb animated Erika's canine member and it set itself free from the wet medical tape. Erika tried burrying the offender more firmly in the mattress, but only stimulated it and it expanded to its full length. Her whole body was tingly, fur spreading from her balls to her asscrack and back. All her joints were hurting and something was pushing out of her tailbone. She was becoming more canine by the minute.
It was too dark for her two drunk friends to notice what was happening to Erika, and they were busy with their heavy petting anyway. Erika could not take her eyes off their young bodies and puffy breasts... They seemed bigger than she remembered them today.
Was the female vial turning her friends into horny lesbians? From the waterlogged diary she had found with Cole, it seemed the vial and the salve were part of an experiment about dog breeding. The salve had developped male characteristics on her, and she was turning into some kind of dog unless she jerked off; what could the vial do? Would her friends turn into bitches?
From the look of it, Piper and Riley looked normal, or at least for now. Maybe their breasts were a big bigger but that could just be the poor light... The room however was filled with pheromones. Only Erika's senses could fully pick them up - the scent of female heat.
She felt her tail trapped in her nightgown as her feet distorted into paws. She bit her lips; she couldn't tell if the sensation was painful or pleasurable. Her head was dizzy from the alcohol, sleepiness, and sexual tension. She could not keep from surreptitiously grinding into the mattress. Canine lubricant was oozing out of her erection, a large damp spot spreading underneath.
Riley's breathing was becoming heavier as Piper and her were frotting against each other. Piper was moaning softly, arching her back as Riley was pinning her down. Erika could smell their genitals from here as the slick, wet noises of sex accelerated.
Rubbing their clits madly against each other, the girls' hips started bucking wildly as climax hit them. Riley arched her back and let out a high-pitched grunt as she tried to stiffle her moans, her dark puffy breasts following her chaotic breathing. Piper turned her head to the side and bit her pillow, letting out a muffled whimper of ecstasy.
An obscene amount of canine pre escaped Erika's hard cock and formed a puddle under her; the mattress was saturated with fluids on that spot. Slowly rolling on her side, she could tell her loins were soaked as well.
She laid as still as she could under the covers, trying not to wag her tail and attract unwanted attention. Rubbing her furry legs discreetly together, she felt they were entirely canine. Emily and Melissa were still deeply asleep fortunately.
Intoxicated by the alcohol and the smell of sex, Erika waited more for Piper and Riley to fall asleep. She could hear the bedsheet shifting and kissing noises as the best friends settled under the duvets, and the room fell perfectly quiet again. Erika's eyelids were heavier by the minute though... She could not fight exhaustion.
Before realizing it, Erika too fell asleep, her member twitching faintly against her belly.