Tell Sarah you saw the room.

"I saw the room." You say. "I know you're not using it for storage."

"How?" She demands.

"I took the keys." You admit. "I had to know what was in there."

"You didn't trust me?" She tries to make you the bad person.

"And I was right to." You say. "You lied to me."

She pouts, unable to argue with that point.

"I know you wear diapers so I guess that explains the changing table." You say. "But why do you have a cot and baby clothes?"

"Tanya treats me like a baby." She explains. "The nursery is my real room."

"Why would she do that to you?" you ask. "I thought you were friends."

"We are." She explains. "I like being a baby and she likes taking care of me."

"So you don't really need diapers?" you ask.

"I'm not incontinent." She explain. "But I've not used a toilet in so long that I probably do need my diapers now."