Libertine Prince and Captive Beast

Summary

Alain, the second prince of the Kingdom of Cors, has faced a dire problem. His mother, the kings concubine, decided to poison the crown prince to make Alain the next king. However, Alain doesnt wish to harm his brothers and join the fight for the throne, so he asks Saul, a Matara warrior trapped in the castles dungeon, for help in order to flee from Cors. To receive Sauls cooperation, Alain must make a special vow with him and confirm it with his body?!