Sakura and Karin-request

This is a request for ~lollster1. Sakura and Karin were in the middle of a training session when she accidentally broke Karin's glasses, now she's going to have to 'pay', if you know what I mean...(waiver of liability: the meaning of 'pay' is completely your own interpretation, I am not responsible for any mental images of a sexual or unsavoury nature, though I wouldn't mind hearing them. Thank you)