Your girlfriend finally agrees to wear a diaper for you. Because of the new territory, she is unsure what she needs to do to get changed. In an obviously wet diaper, she asks you to change her. But you won't give in that easily.

She begs and finally you tell her you want her to rub her wet diapered ass against your cock. Like a good girl, she does what she is told. Lots of squishiness and crinkling. ;)