A Christmas Promise by M. Kato

It’s Christmas and Teruo plans to make it one to remember. Decorating the Christmas tree, romantic walks through the beautiful winter lights, and lots of fun underneath the sheets are bound to make Teruo and Shinji’s first Christmas together magical.
But it’s also Shinji’s birthday and Teruo has one more surprise up his sleeve: a homemade strawberry shortcake to make Shinji’s birthday unforgettable.
Join them in this sweet and spicy short story.

The story takes place between books 1 and 2. Consider reading this story after finishing The Red Collar. It will make more sense. There are no murder or paranormal mysteries in this short story.