Hyde7-3

From Secret of Muscle Monster: Dr. Jekyll/Ms. Hyde
  When Park Jee-Hyi's pistoning became a few beats faster, Park Jee-Hyi finally makes a big sound that she doesn't know whether it's a roaring or a shouting.

This is an urban fantasy story with female muscle monster, based on the famous Jekyll and Hyde theme. The story has very interesting plot.

Illustration generated by novelai. 

Illustration is only for inspiring readers to the story. Please check out the story itself. It is fun!