Shrunken and Bewitched

Logan is a talented baker with a little problem - he inexplicably shrank to a minuscule size. He decides to scurry to the local witch's feet to ask for help, and soon he learns that he is the victim of a succubus - a sexy temptress absorbing his size during his dreams. Gloria, however willing to help, is quite the lazy witch. She doesn't want to put in the actual work to fend off the succubus, so she just orders Logan to reject the demoness in his next dream.
When the plan inevitably fails and Logan becomes even smaller, the witch decides that to defeat the succubus, she will have to beat her at her own game.