"Um. Sarah?" you aren't sure of a polite way to ask your girlfriend if she's messed herself. "Did you have an accident?"
She nods, blushing again. "Yeah."
"Why didn't you go clean up in the toilets at the cinema?" you ask. "Aren't you worried about ruining your dress?"
"No." she says. "It won't ruin my dress."
"Why?" you ask.
"I guess you'll have to find out eventually." She takes a deep breath. "I wear diapers."
"Oh." is all you can think of to say in reply.
After a few moments of awkward silence, Sarah asks. "Are you going to break up with me?"
"What? Because you wear diapers?" you say. "Of course not. This doesn't change how I feel about you."
"Really?" she asks.
"Yes. Really." you say smiling. "But I may have to wind the windows down."
She gives you an embarrassed laugh. "Okay."
"So..." you ask. "How long have you worn diapers?"
"It started when I was in high school." she says. "And by the time I started college I was diapered full-time."
"What happened to you?" you ask. "I mean why did you have to go start wearing diapers in high school?"
"I don't really want to talk about it right now." she says. "Sorry."
"It's alright." you reassure her but the conversation goes quiet for the rest of the drive.
You finally reach Sarah's house and walk her to the door.
"Do you want to come in?" Sarah says as she unlocks the door.