Maya responded "We were having some fun changing some things, myaaa~", still a bit dazed.
"Oh really? How so?"
Maya pointed at the computer as Fel looked over and saw the program. As she examined the screen, Fel saw what looked to be a page full of information on herself. "Is this... me?"
"Y-yeah," said Rina, "say, do you remember what you were doing a few minutes ago?"
"Of course, I just got home from work and decided to stop by and visit my two favorite girls!"
"Well, about that." Rina looked away nervously. She knew that the things they were doing was wrong, but she still kinda liked it. It was a complicated feeling for her, yet it was too late to back down. "A few minutes ago, you were a grouchy old man."
"Hahaha, I didnt know you were such a jokester Rina! As if I could ever be anything other than your adorable babysitter!" Fel reached over and gave Rina a tight hug with both sets of arms--squeezing a dribble of milk out from Rina's full breast.
Rina looked over at Maya; still purring as she basked in the sunlight coming through the window. Rina sighed, "Don't you think its weird that only you and our family are human-animal hybrids?"
"I mean, I guess it is a little weird..."
"Here, let me convince you." Rina sat down at the chair and started to work. First, she made Fel also be aware of any future changes that they make. She then turned to Fel and asked "Is there anything you wish you could change or add to yourself Fel?"
"Ooh, hmm. That's a tough one Rina." Felicia stopped to think. "Oh! What if I lived with you girls? It gets a little lonely all by myself in my house and I could use a bit more... company~."
"Ok then, give me a minute." Rina started typing away at the conputer as Fel cuddled with Maya, making her meow with pleasure as Fel played with the cat girl's pussy.
"And... done." Rina hit enter as the house changed around them.
"W-whoa, what did you do Rina?"
"I made it so you have your own room here. After a few years of you babysitting us as little kids, you started spending more and more time with us. Enough so that you and our parents decided to let you take the guest room and live with us. I made it so that it happened a year ago, so your stuff should be settled in."
Fel sat confused for a minute until a flood of memories rushed into her, giving her memories of this new reality.
"Welcome home, 'sister'!" piped up Maya.
Fel was overcome with giddyness. "Ooh, you two!!" She grabbed them both and pulled them in for a big hug, showering them with kisses. This soon became erotic as they started frenching each other, taking turns giving passionate kisses. It took only a moment before Maya dropped down to all fours and started licking Fel's vagina as she suckled on Rina's engorged breast, both deeply moaning between breaths. They went at it for a while, all of them reaching climax multiple times before falling into a puddle of milk, cum, and sweat. They were all left there panting as they basked in the afterglow.
Rina, exhausted from all the pleasure of today, walked over to her bed and promptley passed out. Maya, however, tentitively took a taste of the tantalizing puddle. The sweet yet salty taste of it made her start lapping it up as if it were her dinner. Fel got up and decided to look at the chronivac.