Ask why she wants you to do that.

"Why would you even want me to do that?" you ask.

"I..." She hesitates.

"What is it?" You ask as gently as possible.

"Okay." Her tone has quickly changed from angry to meek "Promise you'll keep an open mind."

"I promise." You say.

"I wanted you to try being a baby." She explains. "Because I was hoping you would enjoy it."

"Why?" You're only getting more confused. "You want me to be your baby?"

"No." She pauses before admitting. "I want you to be a baby with me."

"Wait." You realise. "Is this why you wear diapers?"

"Yes." She says. "I just wear diapers under normal clothes when there's other people around but in private I'm Tanya's baby."

"And you like being her baby?" You ask.

"Yes." She says. "It's so nice being taken care of so completely."