Fixation

Xanxus was the first to find Mizuki. Not Reborn, not Tsuna, not the Ninth, and certainly not that pathetic excuse of a father. Unsurprisingly, Mizuki followed Xanxus around like a baby duckling following its mother. In the Varia estate, if one wanted to find Mizuki, they only had to look for Xanxus. She latched herself onto his side, his back, his leg, his arm, wherever she could. In the mornings, Squalo would find Mizuki latched onto Xanxus like a small human backpack with her face pressed against his neck as the two slept in. Most of the times when the Vongola Ninth came to visit, he found Mizuki curled up between Xanxus's legs, her ear pressed against his chest, right over his heart. After some Dr. Shamal ran some tests, he confirmed their suspicions—Mizuki had a fixation on Xanxus's heartbeat.