Mark lay on the bed feeling drained. His sexy succubus stepsister had sucked him dry.
Samantha climbed onto the bed and climbed onto Mark, giving him a big kiss with a lot of tongue. Then she cast off her little black skirt and knelt on the bed over him. Samantha grabbed Mark's head and shoved it into her crotch. He got the hint and began licking at her wetness; she tasted like cinnamon. Finding some strength, he grabbed her ass cheeks and squeezed them. Samantha wished Mark had a tongue like she did, but he was a mere human not a succubus. No matter: this part was about reenergizing him so she could get what she really wanted.
As Mark lapped up Samantha's juices, he began to regain energy and felt his erection returning. Moving his hands up her back, he fumbled with the laces on her black leather corset. Samantha helped him cast the garment aside, and slid down his body, lower her breasts to him. Mark played with her dark nipple with his tongue before biting it. Samantha had to bite her lip to avoid crying out with pleasure. Mark repeated this with her other breast.
Samantha couldn't wait any longer. She impaled herself onto Mark's erection, driving him deep into her. She gasped at the penetration. Samantha had a secret Mark didn't know: despite her manner of dress and some masturbation, she was a virgin. Until now. Mark's hands tried to go to Samantha's hips, but she grabbed them and pinned his arms to the bed. She leaned down by his ear and whispered to him: "You're my first. You're mine."
Mark had banged several sorority girls in college, plus him prom date in high school. But he was shocked to realize he was taking his step-sister's virginity. Or was he? It sure seemed like she was doing all the taking! And he was excited by the way she held him down with her demonic strength, her big tits mesmerizing him and she pounded herself on him. She was treating him like a sex toy. Mark didn't last long and muttered a warning to Samantha. She clenched tightly on him and felt him spasm within her. Samantha killed Mark, not only as an expression of her joy but to ensure neither could cry out. With each orgasm, her vagina massaged his penis, squeezing every last drop out of him until he went limp beneath her.
Samantha climbed off of Mark and lay on the bed beside him. She had never felt so fulfilled: physically, sexually, emotionally. Her new succubus body and the pleasures it brought her were the best Christmas gift she could have possibility received. She looked forward to feeding on a lot of men, but knew Mark would let her feed whenever she wanted.