Erika frowned. "I'm very disappointed in you, Cole. I put puppies in your belly to teach you a lesson, but I see you both milked each other dry and quickened your pregnancies to be over before the next "puppy class" with the rest of the pack." Their both looked mostly male at this point, save for Sam's A cup breasts.
"I can't let either of you breed again," she scolded them in a ferm, masculine voice.
She squeezed her canine shealth with one hand and her red rocket came forth, still growing.
"You don't deserve to mate, Cole. Clean up the mess you made on the floor... with your tongue. And because I like you, Sam, you can lick me."
Cole's eyes grew wide as he contemplated the puddle of juices on the floor tiles. If he drank the canine cum, he would turn female again... in the middle of the day, at school! Yet before he realized, his body obeyed his alpha's order and he lowered himself on all four.
Sam kneeled in front of Erika, who had lifted her skirt and lowered her panties to expose her growing canine genitals. She was turning more male by the minute and her ballsack was getting heavier, while her canine rocket was thickening. Sam touched the glistening red member with her lips, and felt her own - human - penis twitch and harden again.
She... she wanted this cock. She could already tell it would grow bigger than Cole's, and as she began licking the four inches and sucking its tip, she couldn't help but wonder how good it would feel to take it all inside of her. She closed her eyes and swallowed as much length as she could, while Erika's cock kept swelling to its full size.
Cole was licking the cum off the floor and got hit by his own pheromones - soon his shameful demeanor changed to a hunger, as he swallowed his goo and felt his body slowly change. First a tingle through his nipple and teats, then his chest getting heavier as breasts grew and swayed under their own weight in his open shirt; finally his balls and shaft shrank between his legs, until he felt a slit open, which quickly became wet. He didn't even care about having his butt up in the air with no pants or underwear on, all he was craving for was the cum stains on the floor while listening to the moans of his girlfriend and their alpha.
Erika's monster cock was nearing 10 inches now and lubricating abundantly. Sam was struggling to suck it clean and had to use both her hands to help manoeuver Erika's erection, which was throbbing in her mouth.
"That's a good girl..." Erika whispered with a husky voice. She looked just like a man, Sam thought, as she realized there was not a hint of any breasts under Erika's school shirt. Sam's own erection twitched at the thought, since she was definitively into guys and had little interest for girls. She could feel herself getting wet, a thread of pre running down her small member.
Erika put a hand on Sam's head to pet her hair, but soon her knot grew large and her hips began bucking against Sam's face, which forced her to hold onto her pet's head more forcefully. A lewd grunt escaped her lips. Sam's almost chocked on Erika's spasming cock as cum exploded in her mouth, and she couldn't help but swallow a large amount of it.
Then Erika's cock dislodged from Sam's mouth and cum hit Sam in the face, with the following ropes landing over Sam's swelling breasts. The goo was turning her into a cis girl again! Sam was on the verge of reaching climax just from the whole ordeal, but she felt her erection shift and shrink as her breasts completely filled the front of her shirt, leaving her a hot frustrated mess.
"Sam... I want you to kiss me," Erika ordered softly as she was catching her breath again from climax.
Sam stood up on shaky legs, a little taller than Erika, and leaned over for a kiss. Erika put her tongue into her mouth and swallowed sensually all the goo that Sam had kept. For a moment, Sam felt Erika's male body against hers, the wet canine member still throbbing against her brand new wet pussy, and she couldn't help but moan, the two of them holding each other in a tight embrace. Sam was almost grinding her clit against Erika's hard-on, mentally begging for Erika to take her.
Cole lifted his head from the cum stains and watched the two of them kiss sensually with a pang of jealousy in his chest. At the same time, there was a stir between his legs, his own pussy craving for Erika's red rocket. In that moment, he couldn't tell if he wanted to be the one kissing Sam, or if he wanted to be her, shivering against Erika.
Then the moment passed and the goo took hold, Erika's body shifting in her clothes and turning her again into the girl she once was. The canine cock retracted into a sheath that itself shrank until only a semblance of clitoris was left, surrounded by soft creamy canine fur. Sam pulled away from Erika, a little embarassed of how horny she was for her alpha.
Cole stood up and the three teens pulled up their underwear and pants. Sam's boy outfit was covered in cum stains, and her hard nipples and dark aureolas showed through the wet front of her shirt.
"I think a visit to the bathroom is in order", Erika giggled with a now girly, high-pitched voice. "Don't forget to come to my place after school, like we did yesterday. There will be treats if you behave well."
Sam blushed again and Cole turned red as a beet. The cum had not only made them female for now, but triggered a heat cycle in both of them, and a persistant warmth was radiating between their legs. Yet neither of them could satisfy the other fully at this point.
They all walked out of the closet, and Erika noticed Emily was gone. Naturally, they walked to the nearby bathrooms to clean up, and where Erika suspected Emily might have disappeared into again...