(Note: I've incorporated into this sub-thread several ideas that were introduced and created by Dandriel for another sub-thread of this story.)
Jen, in the midst of foreplay,began feeling her bestial self take over. She stopped and got up.
Kyle, laying naked on the bed, rose up. "What are you doing?"
Jen, her voice now low and husky, growled, "You won't have that much fun if only I change." She turned on the computer and downloaded a picture of the full moon. Kyle instantly began feeling his body vibrate. His penis, already erect, seemed to thicken further while eyes yellowed.
"Oh, yeah," he said. "That's the ticket."
Jen leapt on the bed and began grinding against him. Extra rows of teats pushed forth from her body as she began licking Kyle's manhood, which was rapidly becoming his beasthood. She felt her control give, and the two spent the next hour forming the beast with two backs.
Both spent, they afterwards collapsed onto the bed and began writhing as they shrank back into their human forms. Kyle got up.
"Wow" he marveled, fingering the scarred bedpost he'd ruined. "I'm such a beast."
"No," Jen said, with a note of disgust. "You're just nerdy little Kyle again."
His face fell until he looked at the computer. "Hey! That picture's still up! I shouldn't be human right now!"
"I forgot to tell you. After they separated us they took me to your old counselor friend Ms. Davidson."
Kyle went white. "That...that she-devil?!"
"Literally. And she made me an offer I couldn't refuse. It involved selling my soul of course, but then again I never had much of one to begin with."
"But Jen--"
"No more 'Jen.' From now on call me Lieutenant Smith of the Devil's Army, Alpha Bitch of the Glendale Werewolves--an elite squadron in Ms. Davidson's war against heaven."
"But why Jen! Even I don't trust her!"
"Yet you begged her to transform you into a werewolf. Listen Kyle: my social life is in ruins, I'll never be head of the cheerleading team, I've committed incest with my dog-werewolf brother, I hate my parents, and the only person who'll fuck me is YOU. Why wouldn't I welcome a shot at supernatural power? Thee all called me 'slut' today but soon they'll all be my loyal lackeys--I'll be Queen of them all. Everyone who ever made me miserable will be serve me with their tale in betweebn their legs! They'll all beg for the chance to kiss my clawed feet! The high school will be mine! I'll--"
"Jen! Your eyes!"
"What about it?"
"They--They're red!"
"Shut up you worm. Just a little side-effect from my appointment with Ms. Davidson. You see, in exchange for giving her a good time, I got a gift."
"The same gift that made me change back?"
She nodded. "My cunt is a now a werewolf-breeding center. Anyone who savors my juices becomes my total lupine slave once they reach sexual arousal. You were my first subject; you turned back immediately after you lost your erection. You see Kyle, you thought you could get back at me; control me; make me your bitch. But now I'm the biggest bitch of them all, and you're nothing but my furry little boytoy. Isn't that so?"
Kyle crept off the bed. "Yes Jen."
"Get down on all fours and tell me that."
Kyle, still naked, got on his hands and knees.
"Jen, I am nothing but your furry boytoy."
"Good. First things first: we have to eliminate the other werewolf."
"Sam?"
"That's the prick. Fortunately the moment I spread my legs for him and beg forgiveness he'll become my slave once we do it one last time. Then I take him back to Mrs. Davidson, and she'll turn him back into a dog. And then I have a little snack."