Perfect Addiction by Claudia Tan deals with the emotional revenge journey of MMA trainer Sienna Lane. Devastated by her boyfriend Jax's infidelity with her sister, Sienna becomes determined to get back at him. She forms a plan to defeat him in the ring, sparking an unexpected alliance and relationship with his rival, Kayden Williams. Although their bond deepens, Sienna's thirst for vengeance risks destroying the new happiness she finds with Kayden.