Max gets the first use since he did buy it after all. Plus he had a perfect way to solve their issue. He didn't mind being the one to change either since most of the time, people mistook him for Ricky and not the other way around. Now they never would make that mistake again.
He spent a good 10 minutes making sure everything was perfect before he confirmed the changes. Ricky watched as his once identical twin brother stretched and pulled until he finished the transformation.
Where his brother once was, now sat his brand new catgirl sister. "Dude what the hell? Why did you make yourself a catgirl of all things?"
"Nyaa! Because catgirl's are cute" said the catgirl who then began licking her wrists before stretching and standing up. "Oh, call me Maya too. Nyaa."
"Stop saying that!"
"Saying what? Nyaa."
"That Nyaa sound. Its weird."
"Fine. Anyways, it is your turn now."
"Wait a second. Why did you do this though? Catgirl's aren't real. Pick something else."
"Nope. Not happening" said Maya with a flick of her tail. She hopped up onto the top bunk without even needing the ladder amd snuggled into her bed. She then quickly fell asleep.
Ricky had no idea what to do about this. So he just left it and didn't touch the device at all. Maya woke up 10 minutes later to am empty room and leaped down from her bed onto the floor. She crawled up to the device to see what her brother did. Only then did she find out that he chickened out and didn't do anything. So to fix this, she figured that she must do it for him.
Knowing him, he doesn't appreciate catgirl's nearly as much as she does. But Maya knew that secretly, he does enjoy cowgirls, and not the western kind either. With a playful smirk, Maya entered in the information to turn her brother into her cowgirl sister, complete with a fully functional udder and everything. It didn't take long for the heavy steps of hooves to echo up the stairs as a vaguely similar looking girl to herself opened the bedroom door while being rather pissed off.
"Maya, what the fuck is this?" Said the girl as she waddled into the room due to her udder hanging heavily between her legs. She was wearing no pants, had a tail, ears, horns and hooves. Her hands were just 3 hoof-like fingers each and she had a rather large bust in addition to her udder.
Maya was just as stacked as her, but had 3 more smaller rows instead of an udder. "Turn me back Maya!"
"Aw, but why? You look so good like this Rina." Purred Maya as her tail stuck high into the air. She was having a lot of fun teasing her sister.
"Maya!" Said Rina as she tried to run in order to catch Maya, but she was just too slow for the speed of a catgirl, and was instead the one who got pinned. "Uh, get off of me, Maya! My udder is heavy enough as it is."
"Is it now? Mhmmm?" Maya crawled off of her sister and stuck one of her teats into her mouth. Except not one from her udder, but from her tits.
"Ahhmmmm!" Moaned Rina as her milk quickly began to be sucked out. She didn't expect that being milked would so good. She didn't try stopping Maya anymore and just enjoyed being milked by the catgirl. After a few minutes, Maya was full, but Rina wasn't empty. Only her breasts were. Her udder was nearing it's full capacity. "Maya, my udder needs milking too. Please. Mooooo!" Begged Rina. She had also mellowed out a lot while her sister was emptying her breasts. But Maya had different plans.
Suddenly Rina let out a surprised Yelp as something rough licked her pussy. "Maya!"
"What? I made us both 18, so we are fine to do this right? We have masturbated together before, so why is now amy different?"
"How about because we are related? We are sisters!"
"Are we though? Your half cow and I am half cat. We also look nothing alike either, so we should not actually be related genetically anymore. We still are sisters, but not in any way that would be bad. Plus we are both girls, so who cares? Twin girls have sex together all the time in porn and they are sisters. Why can't we?"
"Porn isn't realistic, Maya!"
"Yeah, I know. A ton of what they do in porn is bullcrap. Like what man can cum a full bucket load?"
"That's not the AYYYYAmmmmhhmmmhhhmmm! So good! Mmmmm! Oh yeah, mmmmmhhh! Fuck, Maya. Ahhhhh! Right there! Harder! Moooooo!" Moaned Rina as Maya went to town on her pussy with her tongue.
Maya was face deep into her sisters cow cunt and was having a blast. While she licked every inch of her sisters pussy, she was using a clawed finger to tease her own clit at the same time. She was glad that she made Rina weak to pleasure. Where just making her feel good would immediately pacify her. She rotated her body around and presented her own pussy to her sister, who idly began eating her out as well. The sister's continued pleasuring each other until their older sister Rachel walked in on them, only to be absolutely dumbfounded when she found two 18 year old animal girls going at each other's pussy on top of her little brother's bed.