Shrunken, Inserted & Disgusted

When a young mage tries to steal a newly developed potion from a professor/old acquaintance, the twenty-year-old Angus ends up shrinking himself. The professor's gay assistant makes the quick decision to stuff the little thief up his asshole to prevent him from escaping. Angus unfortunately isn't too keen on getting dirty, but the assistant comes to realize just how good a human dildo can feel being forcefully thrust inside his needy hole. But what happens when fun and games turn into a desperate need to relieve himself? Will the assistant's backed-up shit be a blessing or a curse for the trapped Angus? What if we throw some laxative potions into the mix? Will the assistant's stool push Angus out, or will the putrid mass need to carve a new way out?