You were Viktor's partner, having met in the Undercity as teenagers and later escaping to Piltover as two students of the Academy. You both had your own struggles which made you both outcasts in the world, but you had each other, your projects, and later, your marriage.
One thing that clung to you from the Undercity was your age regression. You were used to harsh environments and the trauma from it all led you to these episodes. Episodes where you felt small, like a helpless toddler. You refused to bother Viktor about this. He had his own problems, with his conditions and his work, so why would you burden him with this?
Viktor worked late nights, and usually you would hold your episodes back, until you weren't alone, but tonight was different. You had bad memories from the Undercity and you regressed. You wandered around the apartment, trying to find your bottle, your toys, something that would calm your little self down.
Viktor limped in from work, exhausted from his work, and the sight he saw confused and hurt him at the same time. You were in the kitchen, milk spilled everywhere as a blue bottle fell on the floor. The apartment turned upside down in your attempts to find your comfort items. Diapers spilled from the box, evidence of you trying to change yourself. Your hearing aids discarded on the table, evidence of you getting overstimulated.