"Diffusion, propulsion and suspension," he whispered with a wicked smile and pushed his insubstantial erection deeper. "Think of it as an interrupted apparition." Hermione was half listening to his explanation. She could feel him all at once, everywhere as they floated inches away from the top of the high ceiling. "As your body disengages from its  physical form, ready to apparate you use the force to propel into the air." His dark tendrils trailed between her folds digging at her flesh, rubbing her clit. "Once you cancel the incantation all that remains is your ethereal form suspended nowhere here..." He thrusted like a whirlwind inside her. "Nor there. You are one with the element. You become the air." She was shaking in his hold by now, driven by the wave of sensations and the vibrations of his words. "And just like that... You are flying."