She drives Ash crazy when she's sat around in a towel; dripping wet and smelling like peppermint. He's always sat in the same seat when she emerges from the shower; the seat that lets him see her thighs when she crosses her legs. The seat that gives him full view of the furtive glances she throws at him, the small smiles and the quiet blushes that let him know that she is for his eyes only.
When the Gym is next empty he tests the bathroom door and finds it unlocked, realises he would have found it unlocked any day, and leaves his clothes in the hallway. With forethought he pulls the bolt across, taking a second to draw in a deep breath and calm his frantic heart. She ignores him as he approaches, although he sees her head turn as if to look, and he slips in behind her as if it were the most ordinary act in the world.
"Please, Mist, stop teasing," his voice is husky in her ear as he wraps his arms around her, water cascading around them, "Do you want me?"
Her reply is barely off her tongue before he pulls her round to face him; pressing her lips to his and her body against the cubicle wall. The water washes suds from her thighs and he finds his eyes drawn to the curve of her hip and the smooth skin he finds there. Yet he is distracted soon enough when she balances her heels on the edge of the shower cubicle and pushes herself up to meet him, her lips seeking out his hungrily. With their inhibitions broken Ash enters her with a cry of pleasure; pushing into her against the wall with barely controlled thrusts.
When she arches her back and reveals the pale skin of her neck to him he is lost; planting a flurry of kisses along her jaw, her throat, to finally bite down on the soft skin on her shoulder.
Somewhere in the distance he can hear the sound of doors banging, of Pikachu and Brock arriving back at the Gym. But right here and now there is the sound of water tumbling down around them, of wet skin hitting wet skin, and Misty moaning in his ear to urge him on.