Todd was having trouble sleeping. A student in Coals demonology class, his potion had grown spines on his back, making his normal sleeping position uncomfortable. When Coal arrived at his room he was reading in the hopes that it would relax him. Hearing his door softly open and close, he looked up to see Coal leaning demurely against the door frame in all her demonic glory, his member immediately coming to attention.
“Who…who are you and what…”
Coal tiptoed over to Todd, smiling seductively and laying one long nailed finger over his lips to silence him. “No questions, only fucking. Mmm, by the way, I like the spines.”
Todd had been sitting at his small desk, and Coal had quickly straddled him, caressing his shirtless chest and back, the spines down Todd’s spine now sending little twitches of pleasure rather than discomfort. Coals long tongue snaked into her fellow students mouth, her hard nipples pressing into his warm flesh as she quickly freed his member from his boxers, stroking it gently. Needing no more prompting, Todd quickly pulled the lithe demoness down onto him. Arching her back I pleasure, Col let out a moan as she began to buck her hips in rhythm with Todd’s thrusts. He was nowhere near as big as Xan had become, but the feeling of total domination over the young human was sending her to heights of ecstasy faster than either of the demons had. Coal could feel her body changing more, as the demonic energy she had absorbed from Xan and her other lover mixed with the virile power coming form the boy under her sway, acting like a catalyst. As she rode Tods member, now jammed up against the desk, her legs wrapped around Todd’s waist, the chair in pieces on the ground, Coal let out a moan as her horns began to lengthen slightly then burst out as she reached her first orgasm.
She could feel Todd’s need to cum, and feel her power somehow holding him back, forcing his need to grow. In seconds, her horns had curled round, and back, curving just before her ears and following the line of her delicate chin. With more and more pleasure, she could feel black spines forcing themselves out from her shoulders and elbows, felt her back muscles writhing, and her tailbone itching, stretching.
Feeling that Todd was at the end of his endurance, and that she was at the end of her patience, she released the magic hold on Todd’s loins, letting him finally cum into her. Todd came, and came and came, and when he ran out of cum, it was his life-force that his member was spurting into Coals burning depths, fuelling her lust and power.
With one last simultaneous orgasm, Coal screamed in ecstasy as a sinuous tail forced itself out from between her firm cheeks, thrashing around as it grew out. Letting Todd fall to the ground in coma, Coal stretched, her body sifting, becoming more and more luscious as she stretched, as if growing into a new skin. Looking over her shoulder into a small mirror, Coal admired her new tail, now coiled playfully around a leg, and her new spines and larger horns. The tendons in her calves seemed to have shortened, as Coal seemed unable to lower her heels to the floor, but with the tail, her balance was still perfectly sinuous and sensual, and her new posture added even more sinful curves to her form.
Disappointingly, no wings yet, although she felt they were coming. Obviously, Coal had yet to earn them, had yet to fully embrace her destiny as a succubus. Sauntering out of the room, Coal knew just who she needed to fuck to become complete.