Selina heard and smelled her girlfriend Katty come into her apartment with her new senses. "Selina? are you here?" She asked looking for her. When she was about to answer the heat can back again. Selina felt the need to breed her friend. "I'm in my room." She told her waiting behind the door. When Katty entered the room Selina closed the door and jumped on her and knocked her out.
Selina took Katty to her hideout in the city for when she was Catwoman and packed everything she would need from both her apartment and city to head to the one she has outside the city which was a old bunker made in the 50s in the mountains she found and brought up to date with the technology of her time powered by a underground river dam. When she found it she looked for and read the files about it in the city hall and found it was made to see if it would be a good idea to make fallout bunkers or "vaults" as it was called but no more were made due to the cost building the first one was too high for the government and was soon forgotten afterwards. When she was done moving all of the supplies to the other hideout, she stepped up to her friend who she removed her clothes and tied up with her arms and legs apart.
She waved smelling salts under Katty's nose which woke her up. "What the? Were am I? She said as she woke up and then saw Selina and her new form. "Selina? What happened to you?" She asked her friend. "Well lets start with the fact I'm Catwoman to make explaining this easier." Selina replied with. "What! you're Catwoman!?!" Katty told her. "Yes. Anyway I was hired for a job to break into a chemical lab to get a formula that was made and the data about it. While I was doing my job I decided to look through the data banks and found one that would turn any human or feline into a cat woman. I took it and the one my client wanted along with the data for both. When I got home looked over the data and decided to use it and it worked. But not without a side effect that wasn't in the data." She answered Katty and showed her harden cock to her friend which was one foot long and 3 inches thick and barbed like a cat's.
"What the? why is it like that?" Katty asked her. "I'm feeling horny and you look so hot. I'm going to mate you." Selina told her with a purr. She kissed her girlfriend and then shoved her cock in her mouth. Katty tried to get it out but Selina just kept thrusting it in and out so she just give up and hoped she would be done quickly. Unknown to the pair the formula had another side effect to Selina's body. As soon as any pre-cum or cum from she produces touches any human or cat on their skin it would transform them into a cat woman. Males would become futas while females will become cat women with three pairs of breasts to feed their litters of kittens. It starts off slowly but as more cum enters their bodies it would then take effect faster the more cum they have in them or on them. It will also change their minds to make them more willing to fuck others or be fucked as well.
Selina soon came in Katty's mouth with her cock and her face had cum from Selina's pussy over it. Katty found the taste of her friend's cum good and found herself wanting more. "Damn your mouth was good, now time for your pussy." Selina said which sapped Katty out of her trance. "Please Selina stop this is wrong." Katty begged. "If you want me to stop then why are you wet here?" Selina asked her as she rubbed her friend's pussy finding some pre-cum and showed it to her before she licked it off her fingers and found she liked the taste. "I think I'll have some more of this honey first." She purred before putting her mouth on Katty's pussy and started licking it. "Ah no stop!." Katty moaned which made Selina go deeper with her tongue and finger her. She nibbled on her friends clit which made her arched her back in pleasure. "AH! No more. Please stop it!" Katty begged as she moaned. Her mind was starting to change by Selina's cum as it changed her DNA and the pleasure she was feeling. Selina suddenly bit hard on Katty's clit at the same time as she thrust in three fingers hitting Katty's g-spot. "NYA!" Katty screamed in pleasure nearly blacking out from it.
Selina cleaned off Katty's pussy of her honey and then spoke. "If you thought that was good then think about what it would feel like with me fucking you with my cock." She told Katty who's nearly changed mind did. She said. "Please take me. I-I want to feel more." Selina grinned and lined up her cock to Katty's virgin pussy and thrust in hard with half her cock in Katty. "Ah!" Katty moaned in pain and pleasure from her barrier being broken. Selina waited for Katty to get used to it and when Katty moved her hips Selina started thrusting slowly moaning at the feel of Katty's pussy around her cock. "Damn it's so tight." She groaned. "So big so thick." Katty said losing her mind of all rational thought. Fur started to appear on Katty which Selina noticed. "Your becoming a cat woman too Katty this is good. I was worried of having to go back to get more but looks like I don't have to." Selina said and then started to go faster and harder into her friend. "AH! YES! HARDER! FASTER! RUIN ME. MAKE MY PUSSY FIT ONLY FOR YOU!" Katty screamed as she was fucked. Katty's face had changed into a cat's and a tail was growing. Two more sets of boobs were forming as well while the ones she has grew from a low c-cup to a mid dd-cup. Soon she was a six boobed cat woman. Selina was then starting to hit her mate's womb. "NYA! you're hitting my womb." Katty moaned. "I'm about to cum and impregnate you Katty!" Selina told her. "YES! Breed me! Impregnate me!" Katty begged her mate her mind on nothing but being used as a breeder machine now. Selina thrusted so hard she entered Katty's womb as she came. "NYYYAAAAA!" Katty screamed as she came before she blacked out, over whelmed by the pleasure of her womb being violated and cummed in.
Selina looked at her mate happy that she impregnated her. She pulled out and carried her mate to the other hideout which would become their new home. She took her to her room and set her on a bed and layed beside her falling asleep.