Muss woke the next morning before his sister. Sara’s naked body arousing him especially when coupled with the memory of what they had done the night before. However, in the light of a new morning he was slightly uneasy about what they had done. So, he quietly climbed out of bed without waking her. He went to his room and threw on a pair of shorts and went to the kitchen on his way there he saw the TV and remembered that in his haste to satisfy his urges the night before that he had forgotten to return the movie borrowed from his parents secret stash. Thinking he ought to return it before his parents returned, he grabbed the DVD and went to their closet.
To return the movie to the box, Muss was required to take the box from the shelf on which it was sitting. Slipping the DVD into the space it had vacated, he saw a case that had a naked ape on the cover. Immediately, his arousal returned, and he had to see what the video would contain.
Muss grabbed the case then returned the box to the shelf. He slipped out of the room and returned to the TV. Putting the DVD into the player, he pushed play. The first scene came on and a very attractive youngish, though older than Muss, gray ape walked into what was obviously her room. She looked as though she had had a hard day. She grabbed a robe from her closet and entered a bathroom. Once inside she began to remove her clothes. Muss stared in rapt attention as she lifted her shirt slowly revealing a shapely stomach then gliding smoothly over a full and firm set of breasts. She did not ware nor need a bra, and the sight of her tits made Muss’s hard-on grow harder. He absently started to stroke his erection through the thin fabric of his shorts. Once the gray’s shirt was off, she unbuttoned her pants. Then, she began to remove them taking her panties with them. The sight nearly pushed Muss over the edge, his mouth was dry, and he was leaning forward on the edge of his seat. 
Just as the attractive female was climbing into the shower, his sister who had awakened and come into the room sat beside Muss. He jumped up and was hurrying to turn off the movie when Sara said, “leave it on, please, I want to see this. Come sit down big brother I know you are enjoying this.” 
Reluctantly, Muss sat down slightly apart from his sister. She had put on an almost sheer robe that did little to hide her body. The uneasy feeling was competing with the strong arousal both the movie and what the sight of his sister was doing to his body. He tentatively asked his sister, “Don’t you think we should stop? I mean we are siblings, should we really be doing this?” 
She responded coyly without taking her eyes off the gray that by this point was letting the hot water of her shower caress her naked body, “Stopped what? Watching a naughty film together?”
Muss was struggling to keep his arousal down. The gray had grabbed the soap and had started running it over her body, caressing her breasts and running it through the space between her legs obviously enjoying the feel of it. Muss could not help thinking how it would feel to be the one holding that bar of soap, and after the night before he knew what it would feel like to do so. “You know. We probably shouldn’t be touching each other like we did last night,” he said, though, his resolve was weakening as he continued to watch the naked female enjoy her relaxing shower.
“So. Mom and dad are always telling us we should get along, and getting along means we should make each other happy. Weren’t you happy last night?” Was her response.
“Well yeah it felt really good,” he said meekly.
“Then, we are only doing what mom and dad has told us to do.”
With that, the last of Muss’s doubts vanished as he realized his sister wanted a repeat of the night before just as badly as he did. He returned his gaze to the screen just as the gray was setting the soap down and was really starting to work the tension out of her body. Her hands started to take on a more urgent approach to the caresses of her breasts. The passes over her genitals were longer and more controlled. The look in her eyes was the same as he remembered seeing in Sara’s eyes the night before. Turning to look at his sister he saw that she was mirroring the look he started to realize was lust, and her hands were starting to work over her body just as she was seeing done in the film. Both girls were starting to gasp with pleasure. 
Muss’s was aroused now to the point that he no longer cared what others would think, and he grabbed a handful of his sister’s forming breasts. She gasped and arched her back thrusting her chest into his hand. He grabbed and probed finding the tit and pulling on it and was rewarded with a loud moan. Sara’s eyes never left the gray working her body to an orgasm, as she untied the rope holding up her gossamer robe. She slipped the robe off her shoulders, then stood and let it fall to the floor revealing her young, firm, naked body. When she sat, instead of sitting to the side of Muss as she had been, she sat in front of him. She reached back and grabbed the hem of his shorts and as he rose his butt she slipped them off and down through her legs. Muss’s erection slid flat between her butt cheeks, and she started moving her butt up and down the shaft. Muss despite his shock of his sister’s obvious lust for this new pleasure they had ignited, reached around her body, and grabbed her tits. 
They both were gasping with the pleasure the other was giving, and it was intensified by the moans of the masturbating gray on screen. Sara’s butt was working over Muss’s hard-on, a small amount of the liquid of last night seeped out lubricating and increasing the pleasure. Muss had lowered one hand to Sara’s crotch had soon her juices were adding its lube to the action. All three were getting closer to the edge; all were grunting. The noises from the screen adding its harmony to the siblings moans in a strangely erotic way.
Muss’s finger found a particularly sensitive area, and Sara let out a howl just as the gray on screen did the same. The combined sound of the two females climax sent Muss over the edge and he shot out a stream of liquid up the entire length of his sister’s back, where it stuck to her fur. 
The scene on the screen ended, but the video was not done yet. The gray’s mate walked through the bathroom door just after her orgasm.  He took in the scene and promptly removed his clothes and jumped into the shower. 
The gray started soaping his body down lingering on his member until it was hard. Once it was hard, she rinsed it off and took it into her mouth. Muss let out a groan as he watched her take the head into her mouth. Hearing his obvious desire, Sara got off his lap, turned quickly, and despite the salty, musky taste of the left over liquid began to mimic the gray on the TV set. Muss was amazed at the pleasure generated by the feel of his sister’s mouth. He turned and pulled Sara on the couch in order to let her see the screen as well. While it felt great, she was a little clumsy at what she was doing and by seeing the screen, she was able to match the technique of the gray on screen.
Sara could not believe how good it felt to suck her brothers … cock. Was that what the silver on the screen called it … yes, he just said it again “yeah, that’s right suck my cock.” It was immensely pleasant to make her brother moan and gasp as she worked over his cock. She could feel her privates start to seep her pleasure juice, and she could not help but start rubbing it again. She moaned with the pleasure her fingers were giving, and Muss gasped as the vibrations sent a volley of pleasure trough his body.
The silver on screen pulled his cock out of his mate’s mouth. Muss could think of no reason the male would stop it just felt too good to want to stop. Then Muss watched in disbelief as the gray stood, turned, placed a leg on the side of the shower, and presented the silver an excellent view of her privates. The silver lined his cock up with her privates and asked unnecessarily, “you want my hard cock in your pussy, don’t you, my little nympho.”  Muss did not know what a nyphmo was, but could tell she really wanted that cock in her pussy.
Both Muss and Sara gasped as the silver placed his manhood against the grays slit and pushed. They watched in disbelief as the entire length slipped easily into her body. They continued to stare as he pulled back then pushed it back in. The moan from the gray let the two know that she was enjoying what he was doing. Sara continued to suck on her brother, and with the hand on her privates, she slipped a finger into the hole she found there causing he to moan again. The sight and vibrations were too much and Muss shot even more of the liquid right into Sara’s mouth. Immediately, she instinctively swallowed, and was surprised to find she liked the taste and that as she swallowed her pussy pulsed throwing her into another orgasm. 
Both cub apes by this time were worn out from the amount of pleasure, but they continued to watch as the silver continued to thrust himself deep into his mate. Muss and Sara could tell the two on screen were getting close to orgasms themselves, when the gray yelled, “Cum, I want you to cum in my hot pussy.” Then she screamed as she went into a massive orgasm as he did.
Before the video could continue further, Muss turned the player and TV off. He wanted to finish the movie, but he was too tired to do much more fooling around with his sister. He was also certain if they left the movie on much longer, there would be more fooling around. 
Muss and Sara were sticky from their actions, but they went to the kitchen for breakfast.