Natalie is actually pretty hot like this

Between the warm, moist sensation of his sister squirming in his palm and the sight of her vacant, mouthless body, Aaron found himself getting uncomfortably hard. He snapped his free hand's fingers in front of her eyes with no effect, stripped off her clothes and began playing with her breasts.

The warmth and softness were addictive and the fact that they were his sister's gave a forbidden thrill to his excitement. His sister's mouth had stopped struggling, the soft sound of whimpering coming from his closed hand and he figured she couldn't feel her boobs being toyed with. A sudden indraw of breath from Natalie's empty body and the hardening of her nipples demonstrated that conscious or not, it could still become aroused. The standing figure shivered ever so slightly as he parted her moistening pussy lips with a finger.

Heart beating madly, Aaron looked around and wadded two socks into a ball, releasing Natalie's mouth and jamming them inside when she opened her lips to scream. He dropped it onto the bedside table where it cried through the gag, not nearly loud enough to be heard downstairs but enough to give Aaron the thrill of her distress.

He pulled Natalie's body to his bed and laid it out, its sightless eyes staring at the ceiling as its breathing quickened. It was undeniably horny now, unable to move except for the rapid rise and fall of its breasts and the faint twitching beneath its legs, moist lips hungry to be filled.

Aaron stripped in almost a single motion, flinging his clothes in all directions before pouncing on the unmoving body. There wasn't any need to be artful here, no-one to pleasure but himself, and he only nuzzled the entrance for a second before plunging himself in up to the hilt.

A sudden expulsion of breath caused Natalie's body to moan, despite the lack of mouth, her voice forcing its way out as it fought for breath. It spasmed, arms and legs unable to move with any objective but still instinctively knowing that something had to happen. Aaron felt Natalie's hips rising to meet him as he thrust, her breasts jiggling while her face - still vacant of any soul - nonetheless had a look of **** need.

Aaron felt himself gush inside his sister's soulless pussy, felt it clamp around him, milking him in response to the warm rush it must have felt. Natalie's body trembled, shaking uncontrollably as though having a fit before finally going still once more, the hiss of laboured breathing through its nostrils the only sound in the room.

"That," Aaron panted, to no-one in particular. "Was fucking amazing."