Stop fighting, I would like to be in charge of the 2, and behave more affectionately.
They both shut up and see the lamp shine, surprised they both see the girl grow until she becomes an adult woman, with a well developed body, then her ears and cat's tail grow, just like you and your partner; then your partner starts to shrink, he notices and gets scared, until he becomes a child, but then his face and body become feminized, leaving him like a little cat girl, you feel the same and you start to shrink, you think scared to stop and stay like a preteen, your body changes the same giving you the appearance of a preteen cat girl; everyone looks at each other and the room changes to an adult woman's room. The girl adult then say:
That lamp if it was magical, now I am an adult woman and you are little girls, that is, I am your mommy, saying it happily.
Both begin to tell her to return them to normal with the lamp, and she says no, grabs them both and takes them to rooms that appeared with their new feminized names, and leaves them punished there.
Time went by and apparently everyone excepts you three, believes they always lived like this, days before you start school you keep asking to your new mom to return them to normal, your roommate liked this life, easier, no worries from work and doesn't mind coming back; As things go it seems that you will back to the school as a cat girl.