"Is Matt asleep?"

"Yeah," their dad said, peeling off his shirt and letting it drop to the floor, his hands going to the front of his pants and working those free as well. Matt watched as their dad's cock sprang free, noting almost clinically that there was no underwear to get in the way.

Matt was lost, and relied on the instinct inside Lily's mind. She moved backward, confident in her motion, her eyes never leaving their dad's face. As Matt watched, memories surfaced in her mind, almost like pictures as she sat on the edge of the bed. Matt saw their dad, always from the viewpoint of Lily, ranging from when their dad slipped his hand under her shirt and felt her bare breast shortly after their eighteenth birthday, to the first time he had slipped into her bed the following Christmas Eve, taking her virginity, him bringing her into his room to fuck on the bed he shared with their mom, and even fucking her in the walk-in shower in the on-suite off the master bedroom.

The common theme in most of these memories seemed to be their dad's desire to watch his daughter's face as he fucked her, as her body seemed to know as it slid back on the bed, resting her head on the pillow, her arms reaching out to their dad, her knees spread and bent. Matt noticed that although her attention was focused on his face, their dad's eyes never left her body, roaming up and down her eighteen year old frame from her pussy to her breasts and back.

Their dad climbed onto the bed between Lily's legs, his hand already grasping his cock as he moved up her body. Matt was tempted to jump out of Lily, but he realized he could learn a lot by experiencing sex as a woman. He would be able to know how her body reacted to different stimulation, and use it when he had sex in his own body, so he bit his mental lip (as well as Lily's lower lip, although he didn't realize it), and watched as he pressed the tip of his cock against her shaved pussy.

Matt had seen enough porn to know there was usually some foreplay, and was surprised as their dad wasted no time in pushing his cock deep into Lily's pussy. The feeling of penetration was odd, as if her internal organs were moving aside to allow a slithering invasion that not quite burned. Their dad stretched out over her body, his knees between hers, one hand next to her head, the other squeezing her breast almost painfully as he moved his hips up and down, making Matt feel like she was being stabbed by a blunt object. It wasn't unpleasant, but in no way did it compare to the pleasure Matt felt every time he masturbated.

Matt was getting sore, and was starting to wonder when it would end, when suddenly their dad stiffened on top of her body, thrusting as deep as he could. Her body reacted instinctively, muscles Matt had never felt clenching deep inside her, an artificial groan escaping her mouth as the oddest sensation by far hit. It almost felt like he was filling her body with hot lead, but Matt realized their dad was cumming deep inside Lily. She groaned again, although Matt never felt a change in the sensation. If this was the extent of a female orgasm, no wonder why they weren't as excited at the idea of sex.

The pulses of hot liquid ebbed, and their dad pulled his cock out of Lily almost before the last squirt of semen pumped into her. He crawled off the foot of the bed, his cock leaving a trail of semen on the cover that brought up memories of Lily cleaning similar trails. "You were wonderful," their dad breathed as he bent down to gather his shirt and pants.

"You were too, dad," the lie popped from her mouth automatically. Apparently this exchange was as regular as their sexual trysts.

He walked around her bed, bending over and pressing his mouth against hers, the first kiss he had given her since Matt had jumped in, but it was such a quick peck it seemed chaste compared to what had just happened. "You're so much tighter than your mom," he breathed in her face before pecking her lips again, turning around and walking out the door.

Matt was so shocked at the abruptness that he missed her hand moving automatically between her legs, her long fingers quickly finding the button at the top of her pussy. She rubbed her clit, her hand massaging the breast their dad had squeezed, her fingers gently pinching her nipple. If the sensation of penetration was odd, the feeling Matt felt now was completely alien. Instead of the pleasure focusing on one part of her body like he was always used to, it radiated from both her hand on her pussy and her hand on her breast, meeting in the middle in what seemed to be an explosion of pleasure meeting in the middle. She arched her back as the orgasm, one stronger than any Matt had ever felt, washed over her body, biting her lower lip again to prevent the outcry from bursting out of her mouth.

She relaxed, breathing hard. Matt could read from her memories that this was how she had to finish every time their dad had sex with her, and he vowed he would never make any woman have to resort to finishing herself off. He jumped back into his own mind, interested to find out he could remember the dream he had been having at the same time he had been inside his sister's mind. Apparently the ability he had merged his automatic responses to his outward memories even while his own body slept. He felt a bit guilty at leaving Lily clean up after their dad, but the thought quickly faded as his birds eye view of his naked twin sister floated into his mind, and he wondered if he could get her to fuck him like she fucked their dad.

Of course he could, he thought as he drifted off. All he had to do was be her as he did.