Kendra didn't even wait for her full transformation into a catboy before mounting Eddie. When Kendra's penis slid into Eddie's vagina, he cried out with surprise and pleasure. Kendra, feeling concerned, tried to pull out but her cat cock had already had its barbs in.
"Are you okay?" Kendra asked.
"This is...amazing" said Eddie. "No wonder you and Tammy like it so much."
Kendra smiled and started thrusting away, faster and faster to satiate her lust, drawing more cries from Eddie.
Midway through plowing her lover, Kendra's cat ears heard the front door open and a brief glimmer of realization flashed across her mind. Her mother! Far too late now to do anything, but keep going. The furious fucking continued until both climaxed and were left wet and exhausted on the floor.
---
Kendra slowly stirred. How long had she and Eddie catnapped after sex? Then she sat bolt upright. Her parents were going to kill them! That's when she noticed she was back in her normal female human form and Eddie was once again a human male. The changes hadn't been permanent. She woke Eddie.
The two of them showered, getting cleaned up and dressed. They shared a kiss then sheepishly made their way out to the living room. Kendra's parents were in the midst of a hushed but heated conversation which they broke off. Eddie and Kendra made their way to the couch and sat down, ready to face the music. Moments of tense silence passed.
"I'm sorry. I was the one who pushed Kendra on this."
"Eddie, are you ready to be a father?" asked Kendra's dad.
"No..." Eddie sheepishly replied.
"How about a mother?" came the followup question.
"I...uh...what?"
"We understand you're both 18 and in love and your hormones are running wild, but you're both being incredibly irresponsible," explained Kendra's dad. "That's what really bothers us about all this. Did it ever occur to either of you that if you were transforming despite taking your potions that something was wrong? If the dose is too low to prevent your transformation it could also be too low to be effective birth control."
Kendra and Eddie had a moment to let that sink in.
"Do you know why your transformation this morning was transgendered?" asked Kendra's mom.
"I must have gotten the potions reversed" said Kendra.
"No, that wouldn't cause such a change. What else have you two done lately that be the reason. Or should I say who."
Eddie and Kendra exchanged surprised and worried glances.
"I think it's time you two were completely honest with us" said Kendra's father. "Start when Eddie found out you were a werecat and go from there. Both of you."
Kendra looked at her parents, then at Eddie, then at her parents. She didn't really want to discuss her sex life with her parents, but she realized they were right: she and Eddie had been careless and irresponsible. She let out a resigned sigh and began to recount the frenzied last 48 hours - forgetting her potion, starting to transform at school, sex with Eddie, him becoming a werecat. She tried to be as vague as possible about Tammy. Eddie chimed in to add some things here and there, particularly how Tammy had gotten involved in all this. He was clearly uncomfortable admitting to his first hookup at school with Tammy because it made him feel like he had cheated on Kendra. They admitted to Tammy's unexpected return last night and what ensued.
"While you're fortunately not pregnant - otherwise you would be stuck female for the duration of the pregnancy - you're both going to have something to worry about besides just being werecats" said Kendra's mom. "It seems your friend Tammy has a very rare were-STD. That's why she transformed like she did last night and the two of you changed today. There's no cure. For the rest of your lives, every time you transform you might end up with a temporary sex change."