You are free to use this image in a cap/story if you wish. If you want to and don't have a story in mind, here is something to help get you started:

A woman is friend's with a wizard, who is still a amateur. As a result, he often tests spells on her. This scenario involves him testing an inanimate transformation spell on her, transforming her into his underwear.

The image(s) used don't belong to me and I will remove this post at the behest of the copyright owner(s). I claim no ownership of the image(s).