Elementary aged boy with executive dysfunction and self-care problems getting unknowingly feminized by the high-schooler assigned to them to help.
Wardrobe being replaced with their little sister's hand-me-downs under the guise of washing their old clothes and 'vitamins' to help them feel better.
Eventually working on bathing habits, focusing a little too much on cleaning their little cock until they have their first dry orgasm; afterwards given some 'lotion' to help soften their skin.