THE BITTER VENGEANCE Shredder related TMNT story

⚠️🔞Some chapters of this book is inappropriate for underaged readers. It is a dark and brutal story about TMNT. Book contains violance, torture, abusive parenting and sexuality.
⚠️ DISCLAIMER: I don't own TMNT(Teenage Mutant Ninja Turtles) characters. They belong to Kevin Eastman and Peter Laird. This is a Fan-fiction story.
⚠️The only added character in this story is Dr. Gwen Miller (OC)
⚠️ English isn't my first language. If there are some grammatical errors sorry about that.

Hamato Yoshi A.K.A the Splinter and Oroku Saki's A.K.A the Shredder's elder brother Oroku Nagi fall in love with same woman who called Tang Shen. One day while Oroku Nagi and Hamato Yoshi were fighting over Tang Shen, Yoshi killed Nagi. Then Hamato Yoshi escaped to U.S.A illegally. Shredder become the new leader of Foot Clan also a crime lord. Shredder finds Hamato Yoshi and pour an ooze which is called mutagen on him. Shredder doesn't know the ingredient of mutagen and he thinks it is going to kill his nemesis but Hamato Yoshi mutated into a rat. Accidently some of the mutagen effected Yoshi's four baby pet turtles and they become humanoid turtles. Yoshi A.K.A the Splinter raised them as his sons and tought them ninjutsu. Turtles have became crime fighters. Shredder and turtles have been fighting with eachother for years. One day Shredder's plans have sabotaged by the Turtles as usual.This time that is the last straw for shredder. He is determined to take a revenge against turtles and Splinter. Shredder and his off world ally Krang make a new ruthless plan. According to their plan Krang find out an unique physicks study and he decided to kidnap the scientist who conducted the research. When young scientist Dr.Gwen Miller kidnapped by Shredder her life changes complately...While Shredder and Krang are working on their ruthless plan, horrifying incidents occurs to happen unexpectedly. This situation has been threatening not only life of shredder and the turtles but also all