Naruto: Oops, I Became Lin's Bai Yueguang!

After traveling into Uchiha Shisui, there seems to be something wrong with the system I am bound to. [Golden Entry: Sister's Favor] - Bind to the gentle senior sister Nohara Rin, can you become stronger by maxing out your favorability? Touching the head to kill +1, hugging +2, fighting side by side +5... [Silver Entry: Dessert Lovers] - Share three-color meatballs with Mitarai Anko to unlock the "Sweet Tooth Warrior" talent? Exploring the store together gets +3 vitality, and being praised for having professional taste +2 favorability. [Blue Entry: Medical Assistant] - Handing Shizune a cup of tea when she is so busy that she triggers "logistical care"? Emotional soothing +2 affinity, efficient equipment delivery +3 hand speed, and gaining +1 vague approval from Tsunade-sama as "fairly useful". A few years later, looking at his already explosive popularity and strange skill tree, he also looked at Lin beside him who had quietly changed from a gentle senior to a dedicated nanny. Shisui said, what about the promised Ninja Shura and the fateful duel? Is there something wrong with this peaceful route that relies on brushing up my sister's favorability and doing daily chores?