Rita watched the teen, unsure whether she should even be worried or not; while strange, Leah's behavior wasn't exactly a problem. Sure, it's rather infantile, but Leah seemed grown up for the most part. That was until Rita heard a little toot. Leah let out a little gas, still focused on her show as she scrunched her face. She leaned against the coach, lifting her knees slightly until her diaper poked out. With a quiet little grunt into her thumb, Rita saw the bottom of her diaper stretch out as little farts continued to exit. As it grew larger and began to stain brown, Leah's eyes never left the screen despite the bowel movement taking clear effort. With a final squeaky fart, Leah let out a sigh of relief and lowered her knees, shifting back into a comfortable sitting position without a care that she's squishing the sizable load into a bigger mess.
Rita stood in awe, jaw fully dropped. It was one thing to need diapers, as incontinence was not an uncommon issue. This, however, was the behavior of someone who has never used a toilet in their life. That, in addition to her other strange behaviors, lead Rita to one conclusion: Leah was clearly not a teenager. Teenagers were moody, and horny, and tried to sneak into pornos and do drugs: in other words, tried to do adult things they were clearly too young for (at least as far as Rita was concerned).
Leah was not that; she was a child, and a very young one at that. That meant she needed very different care.
As Rita started thinking over how to deal with this new development, the show ended and Leah was freed from her engrossment. Having a mostly positive view on what she watched (in her head, watched ironically), she was smiling when she became aware of both the thumb in her mouth and the state of her diaper. Blushing at yet another stinky accident, she plopped her thumb out---wiping it on her shirt rapidly---as she jumps off the couch.
Deciding she probably didn't need to tell Rita, Leah went off to change her diaper once again. She was honestly stating to get worried; this time, she didn't have the excuse of being asleep. In addition, she was finding herself sucking her thumb habitually, despite it being something she hasn't done in over a decade. She quickly changed herself, not wanting to be in the filthy diaper any longer than she had to. Guessing that breakfast was probably finished by now, she made her way towards the kitchen.
"Hey Rita, sorry for disappearing. Is breakfast read-" Leah froze mid sentence as she entered.
"Oh, Leah! Sorry, I had to make a last minute change," Rita said, tone noticeably more patronizing, "Your breakfast is now..."