Marble's sleeping sister

It had been a rougher day than normal for Marble, every time she looked at Maud her cock did a little jump. During her nightly shower she blew her load while thinking of her, life was getting turned upside down since she saw her naked. Marble was going to her room, but instead she stopped in from of Maud’s again. She couldn’t force herself to go on, she knew behind that door Maud was lying on her bed asleep, and nude. She reached out and opened the door

Maud was lying on her bed with nothing covering herself, she was completely exposed. Marble wanted, no needed a closer look she couldn’t just stand in the doorway, she wanted to be able to see everything, so she went and stood next to her sister's’ bed. As she looked lustfully at her sister her heartbeat increased. What if Maud woke up? what if someone saw her looking over her nude sister? As she was thinking this her heart was beating in her ears like drums, but that wasn’t the only thing beating. Her cock was completely engorged and throbbing, it ached to breed this delicious looking mare.

After staring for a while, and trying to breathe as quietly as possible Marble started to move. What if she touched her sister just a little bit? She could just say she was warning her that her door had been left open again, not even thinking what Maud would do, or say when she saw her throbbing horsecock. She reached her hand down and pressed it against her shoulder, her skin was soft as anything and sent a tingling sensation up Marbles arm. She then started to move her hand down from the shoulder, onto her sister's chest. She grabbed one of her sister's tits in her hand, and started to rub it. After a bit she reached out with the other hand and grabbed the other free tit. She was grabbing, and rubbing her sister's tits while she slept, with a rock hard erection throbbing between her legs.

While she rubbed her sister's tits, Marble started to jerk her hips a bit, her body knew there was a female ready to breed in front of her. She was too enamored with the feeling of her sister's tits to pay any attention to her own hip thrusts, or the pre on her cock. Her sister's tits felt amazing to grope. She started to rub her fingertips on the nipples, they were hard from the night air. Maud had thick full nipples, the kind that just begged to be sucked or pulled on. Marble rubbed the dense tips around with her fingers and gave little pinches and pulls, her own nipples felt nowhere near as good to play with. It was like everything she did to them prompted another jolt through her hand, she stayed like that for a while, entranced as she rubbed and pinched her sisters nipples.

Out of the corner of her eye Marble saw a slight glisten of light. When she looked down between her sister's legs, her slit was wet. If her cock was as hard as rock before it was hard as steel now. She took her hands off her sister's chest, crouched down at Maud’s feet, and put them on her thighs, was she really going to go so far as to play with her sister's pussy? Then she noticed the small amount of arousal leaking out of her and she decided. Reaching out her hands she put them on either side of her sister's pussy. Then slowly, she started to part her lips, exposing the pink hole inside. Even though Maud was asleep her pussy was moist and ready inside. Marble double checked that Maud was still asleep before opening her pussy even wider. Through the moonlight she could see Maud’s still intact hymen, she knew that Maud hadn’t been sexually close to anypony before, but this made her realize that Maud’s first sexual encounter, whether she knew it or not, was with her own sister.

This might have been something to think over if Marble was in a right mind, but in front of her was not only a mare's pussy, but an aroused one. Marbles arousal got the better of her as she rubbed her finger around the outside of her sister's pussy, she could feel the heat and moisture radiating from her pussy. Marble’s cock was leaking a constant stream of pre onto the floor, it was making a decent size puddle, her body desperately wanted to deposit its virile cum into this mare's womb. Slowly she started to push her finger inside her sister's pussy, wiggling and feeling around, wondering what it would feel like on her cock. As she played with her sister she pushed another finger in, she started to pump them in and out slowly, spreading her sister's pussy, and fanning her juices.

Once Marble got a good whiff she could hardly control herself, her cock alternating between bumping her belly and the floor, as she pushed forward so she could get a better smell of her sister. Her fingers started going faster and faster, till she was properly finger fucking her sister's pussy in front of her. While she was getting a close look at her pussy, she started thinking to herself that since she was already down here, she should see how it tasted. She removed her fingers and started to lick the outside folds of her sister, but this quickly devolved as she tasting more and more of the aroused mare. She started pushing her tongue harder and harder against the lips, until finally she stuck her tongue inside. Not even slowing down she kept pushing her tongue deeper in until she was making out with her sister's pussy, her tongue deep inside, feeling and tasting everything it could. Suddenly she felt her sister shake a bit, the first movement of the night. Marble froze terrified that she had just been caught; instead she felt her tongue being clenched and fluid coming in her mouth. It was her sister's cum, she had just eaten her sister out till she came in her sleep. She had never felt her cock as hard as it was right then.

High on adrenaline, sexual arousal, and pussy juice she had an idea pop in her head. Since she had just tasted her sisters cum, then why not repay the favor? She stood up and grabbed her long, hard, leaky, dick placing it against her sister's mouth. She pushed in just a bit trying to get some of her pre into it. Instead Maud feeling something poking her lips, opened her mouth and latched on her sister's cock head; sucking and rubbing her tongue all over it, probably dreaming of some sort of ice cream or other tasty treat. Marble froze in place at the sensation of her sensitive head being sucked and licked. She was still frozen in pleasure and surprise when her orgasm rocketed up her cock. Maud on the other hand just kept sucking in her sleep, drinking down Marbles thick cum as soon as it came in her mouth, her belly slightly distending from the big load. When she finished cumming Marble stood in a dazed post orgasmic state as her sister sucked on her slowly softening shaft, it had been the best orgasm she had ever felt. Suddenly she snapped out of it, she had just eaten out her sleeping sister till she came, then she had pumped her hot cum in her stomach. Maud was going to know something had happened.

Marble quickly cleaned up any hint that she had been there, including the puddle of pre she had made on the floor. She hoped that she hadn’t left any evidence, and that Maud wouldn’t know that anything had happened last night. There was no way to tell though, until the morning came and Maud work up. Marble had trouble going to sleep that night thinking of what she had done, and how good it had felt. She promised herself though that if Maud didn’t find out that morning, she wouldn’t do it ever again.