She was kneeling behind him, wearing just her panties, thinking.
Their positions, their roles, were reversed: he was on all fours, in front of her, and she was on her knees behind him on the bed, looking down at his back. His ass was in the air, and she studied the muscles of his spine and shoulders, watching him breath. It was different and kind of confusing, this switching of places.
She noted again his softness; he was pale and not very muscular. From her new vantage point he looked weak, and to her internal shock she felt a glimmering of contempt.
He lowered his head, and she thought, "Is that how I do it? Is that what I look like when he's fucking me from behind?"
Tentatively, she reached out and placed her right hand on the small of his back, rubbing his hip and thigh with her left. He twitched a little, and she had a flash of power, and had a glimmer of what he felt when she was in his place. Reaching around with her left hand, and pushing down on his body, shoving him gently into the bed, she felt for his cock. When she found it, pointing almost straight down and only slightly hard, she touched the tip with her thumb and index finger, stroking and pinching softly. Thinking of what he would do, she moved closer and made contact with his ass and thighs with her belly.
He pushed back against her, and she returned into him, feeling another little shock of powerful control. Rubbing her panty-clad pussy against his ass she continued stroking and rubbing his cock, moving down along the shaft lightly and cupping his balls. She kept her other hand on his back, making circular motions with her palm. His skin felt hot and smooth.
She leaned over until her belly was fully against his naked skin, and then folded forward far enough for her swaying breasts to brush against his back. He shuddered when her nipples touched him, and she did it a few more times, sashaying from side to side to just barely touch with the tips of her tits.
His cock got hard, very hard, and she could feel him pulsing in her hand.
She wished, in a sudden, shocking image, that she had a cock and could fuck him, penetrate his body like he fucked and penetrated hers. The realization surprised her so much she stopped moving for a minute, to think and absorb this new part of herself she hadn't known was in her at all. She felt aggressive and sexual, not exactly 'masculine', but certainly desirous, and with a sense of near-violence.
Rolling with the sensation, she shoved against him harder, and he bashed back against her. She'd neglected the rock-hard cock while she'd been thinking, and leaning over some more she grasped the entire shaft in her hand, squeezing. Her breasts pillowed on his body, and he reared up slightly to make more contact.
Stroking the cock in her hand, making as much of a pussy as she could, she removed her free hand from his body and quickly tugged off her panties, awkwardly yanking them over her feet. She tossed them on the floor and reached her arm around him, covering his body, hugging as hard as she could while shoving against his ass with her pelvis.
She wanted to be a man, a male of the species, to have a raging cock to impale and fuck the body below her. She almost laughed at the incongruity and slight craziness of the thought, but made a conscious decision to simply let her mind and emotions free. Almost involuntarily, her movements and acts got more aggressive. She roughly stroked his cock, making it her own.
