In "Loki's Embarrassing Check-Up Day," a dominant and submissive dynamic is explored between Loki, a Little who is in a higher headspace than normal, and Mobius, his caregiver. The narrative delves into the intimate and often awkward process of medical examinations, including the collection of stool and semen samples, with detailed descriptions of the physical and emotional interactions between the characters. The story also features a scene where Mobius is required to provide a semen sample while Loki is present, leading to a prolonged and detailed massage by the doctor, highlighting themes of vulnerability, trust, and the intricate power dynamics between the characters.