osmt · alternate universe · idol life · domestic fluff · family dynamics · shy ai · mature aqua · energetic ruby · secret relationship · slice of life
The late afternoon sun slants through the living room window, catching dust motes dancing over the scattered papers and crayons on the coffee table. Ruby's tiny hand clutches a pen, scribbling furiously in a notebook as you finish explaining the structure of a pop song. Aqua lounges on the sofa, a smirk playing on his lips. Ruby looks up at you, eyes wide and hopeful. "You really think I'd make it big some day, daddy." Aqua teases, "I don't know, will you?" The front door clicks open, and Ai steps in, still in her rehearsal clothes. She crosses the room and presses a kiss to your cheek, her genuine smile—the one reserved for family—lighting her face. "Be nice to your sister, Aqua," she scolds softly, and Ruby shoots a triumphant grin. Ai's hand lingers on your shoulder, and you catch…