The Substitute for a Substitute

Remus gets a job as a Muggle substitute teacher for fun for a couple of months, but when the Full Moon is only nights away it destroys his health. Sirius takes care of him like all the times prior with much fluffy -iness. But the school still needs a teacher, making Sirius have to step up and leave Remus to teach the 10 yr class in his spot. One-shot. Kissing. Wolfstar. Cuddling.