"Your butt is, like, really, really big, did the Coats do some sciencey stuff and make your butt bigger and bigger? Is it ever going to shrink down?"
"Uh, Bixxti means, like, your butt is bigger than that one time Laela accidentally sat on a needle thingy and it puffed and puffed and they couldn't get her off until she was huge, like, really big!"
She takes a breath.
"Wow, your butt's so big even Bixxti could fit in one butt cheek, right? Don't worry, Bixxti is sure it'll get smaller eventually, Bixxti promises!"

The Opossum hybrid opens her mouth to reply, but-
"Bixxti's mom Lyyona can probally help you, she knows some Coats who are really good at figuring stuff out, maybe they can get your butt smaller again?"
...
...Bixxti smiles.

Content she's not going to cut her off again, the Opossum hybrid replies, "heh, no, kid. I was born with this backside," she gives her thigh a slap, it doesn't jiggle much, "they're not sure why, but my big as- uh, /butt/ is natural. Sure I keep breaking chairs, but it's fine. The better question is why are your ears so big?"

Both laugh.

(Made this as a dumb excuse for a height comparison, TBH.)