The best way Theo can be described is that reading it feels like napping on a big bed full of comfy pillows and blankets. Whenever I think about my favorite BL manga, Theo always comes to mind first. Rei and Theo have a really cute dynamic as a couple; Rei's affection and attachment towards Theo are really obvious through his actions, while Theo might be a bit inexperienced/oblivious at first, but he's always very caring and devoted to Rei from the start. For a one-shot, it still manages to feel packed with worldbuilding and plot, both the story and characters are very well written. The author'sartstyle is beautiful and really fits the fluffy and ethereal vibe of the story.

If you like supernatural romances, then you should absolutely give this one a try. It's a really good option if you're looking for something cute and light to read.