You find it adorable

Although you are surprised at first, you try to imagine your girlfriend being babied by her best friend. The image you get in your head is irresistible.

"That's actually really sweet," you say, "Tanya must make a really nice 'Mommy.'"

Tanya chuckles. "I do my best."

As for Sarah, she is just happy that you are so accepting of her lifestyle, and gives you a passionate kiss on the lips, which you happily accept, as well.

She then pulls away, and she said, "You know, Dan, you look pretty sexy in that diaper."

You just blush. "Um, thanks."

Tanya then looks as thought she is getting an idea.