Dinner was uneventful, which was good. Melinda had told her step-father that she was doing extra credit in Math to pull her grade up. His only comment was a grunt, a glare, and a growled "I'll believe it when I see it!" Afterwards, Melinda helped her mother with the dishes, then retired to her room to do homework. She stripped off her shorts, and sat at her desk clad only in her tee shirt and the bikini panties that she had worn at school. The crotch of her panties were still moist from her afternoon's adventures, and she could smell the musky scent of her sex. She was still horny, she realized as she sat there and tried to study, but couldn't. The thought of beautiful Karen licking her pussy until she came paraded through her thoughts. And the twins, standing at attention. And Karen, lapping cum out of Mr. Johnson's cupped hand like a dog. And the dogs. The big red sex machine fucking the daylights out of the tiny blonde. Melinda was disgusted, yet excited at the same time. And definitely still horny. Melinda leaned back in the chair and slid her hand under her panties. She could hear the TV blaring downstairs, so she knew that her mom and step-dad would be occupied for a while. Her eyes closed and she started to gently massage her mound, and she started to remember the afternoon's delights, moment by moment. she could feel the moist fabric of the panties scrape against the back of her hand. She was startled out of her reverie by a coarse whisper. "Whatcha doin' Mel?" She turned quickly to the door to see her step-brother standing there, a depraved grin spread across his face. Rob was two years older than she. He was tall, and not bad looking, with shoulder length brown hair, dark eyes, and a nice body. Melinda froze, her hand still in her pants. "Whatcha doin' Mel?" the course whisper echoed again. Melinda blushed furiously, but didn't speak. What could she say? Rob had been attracted to her from the first, she knew. Almost every day he found some excuse to stop by her bedroom and make some comment on the way she looked. And she had to admit that she enjoyed the attention. Occasionally, she would even tease him a little, by walking down the hall with only a towel draped around her otherwise nude body, or bending over in front of him when she wasn't wearing a bra, or numerous other seemingly innocent acts. She liked the reactions she would get from him. Like seeing his adam's apple jerk in his throat as he swallowed hard. Or the blush on his face when he knew he had been caught looking. "Whatcha doin, Mel?" the coarse whisper came a third time. He was different looking this time, Melinda thought as she stared at him. There was a knowing gleam in his eye as he had suddenly realized she may not be as innocent as she acted. He grabbed his crotch meaningfully, cupping his balls in the palm of his hand. He was wearing only jockey shorts, and Melinda noticed how big the bulge of his cock was, for the first time. She looked at it speculatively, and decided that he wasn't hard --- yet. "Why rub yourself raw, when you could have this?" he asked hoarsely and leered, bouncing his heavy balls in his hand suggestively. Melinda couldn't help but notice the way his heavily muscled chest flexed when he did that, and admired the way his wide shoulders tapered to narrow hips and a muscular, round butt. There was a circle of fleecy brown hair around each nipple of his otherwise hairless chest. Rob stepped into the room after looking down the hall toward the stairway. Quietly he closed the door and stood there for a moment, staring at his step-sister. His hand remained on his bulging crotch, but remained motionless. Melinda didn't move. Her eyes were glued to her step- brother's crotch, and without conscious thought, she licked her lips invitingly. Her finger moved ever so slightly again, rubbing the clit that was concealed in the slimy fold of her slit. "Let's see what I could have, Rob!" Melinda said in a raspy whisper, while rubbing herself again with a more obvious motion. Rob grinned openly, and pulled the elastic waistband of his jockey's down in front to expose his cock. He positioned it band under his balls and let it go. The elastic lifted his heavy cock and balls causing the quickly hardening organ to jut out at her. Melinda could see it throb with every beat of his heart at it grew heavy with blood. It was framed with a dense growth of curly brown hair. "Bring it over here!" she commanded in a husky whisper. By the time he crossed the few feet of carpet to her desk, his cock was pointing proudly toward the ceiling. She looked up to his face and peered directly into his eyes as she enveloped the head of his throbbing cock with her lips and sucked on it lightly. His eyes rolled back in his head as his eyelids slammed shut. He let out a loud groan. Melinda quickly removed her mouth from his cock and whispered harshly, "Quiet! You keep quiet, or we're busted! You want them to hear us downstairs?" Rob's eyes opened wide in obvious fear, and he shook his head no. "Sorry," he hissed. "It just felt so good!" Melinda smiled at him perversely and clamped her lips around the head of his cock again. This time she ran her tongue around the top of the head, and then flicked the sensitive underside of it several times with the tip of her tongue, before engulfing about half of it with her mouth. Her finger continued to rub her swollen clit as her slit became even wetter. Rob stifled a groan successfully as Melinda sucked and licked at his cock. Then Melinda grabbed his heavy balls with one hand and squeezed them gently. Without warning she felt his legs stiffen and a hot slug of his cum jetted out of the end of his cock and slammed into the back of her throat, almost causing her to gag before she swallowed by reflex. Within seconds, he was pumping load after load of hot slimy fluid into her mouth and she was swallowing the thick fluid as quickly as she could. She couldn't believe it! She had barely gotten started, and he was cumming already! The syrupy flow subsided, and Melinda felt his legs relax as his orgasm receded. She looked up at his face as she sucked the remaining juices as they oozed out of the tiny opening at the end of his cock. He had a speepish grin on his face, and was noticeably embarrassed. "Thanks, Mel," he murmured softly. "What about me?" she complained, letting his softening cock drop from her wet lips. "Gimme a sec," he mumbled quietly, then reached down under her arms and lifted her bodily from the chair. He turned around and set her down on her feet, then sat in the desk chair. His jockey's were still on and the waistband pushed his cock and balls up from between his legs. Rob reached out and pulled her wet panties down to her ankles, and Melinda dutifully stepped out of them while she pulled her tee over her head and threw it to the bed. He pulled her to him and took one nipple into his mouth roughly. It was still sore from Mr. Johnson pinching it so tortuously that afternoon, and she gasped, too loudly. Rob thought that meant she was enjoying it and went to work with his tongue and teeth feverishly. In spite of the pain, she felt her nipple harden quickly at his harsh touch. He was squeezing the other baseball-sized breast roughly with a calloused, muscular hand. Rob's cock was growing hard again quickly. He turned her around, grabbed her waist and pulled to down to his lap. His hard cock nestled in the crack between her ass cheeks. Melinda felt one hand reach up and grasp a breast, as the other squeezed in between her ass and his thigh to grab his stiff cock. As she lifted herself up slightly, he positioned it and pulled her back down. Melinda felt the head of it try to penetrate her asshole, which was still sore from Mr. Johnson's rape of it the previous day. She cried out sharply in pain, then covered her mouth quickly with her hand. They both stopped and listened intently, to see if they had been heard. The TV continued to blare downstairs, and there was no indication of any activity. Melinda reached between her legs and grabbed Rob's long cock with one hand and positioned it properly in her wet slit, then sat down on it, totally engulfing it in one smooth maneuver. They both gasped softly at the wonderful sensation, and Rob started to lift his hips to meet her slow undulations. They established a satisfying rhythm quickly, as if they had been fucking each other for year. "O-h-h, yes, Rob," Melinda hissed. "Fuck me with your huge cock. Fill me up with it! It feels like you're breaking me apart!" Rob let go of her tit and place both hands on her hips, pulling her down farther on his cock. He see-sawed her hips back and forth rotating them slightly on his cock as she slid up and down on him. Melinda felt a small shudder in him, and reached between her legs ro rub her raging clit. He wasn't going to do this to her again! "I'm close, Mel," he advised hoarsely, and started moving his hips savagely to thrust into her even more deeply. Meldinda felt a shiver track down her back and clamped her cunt muscles down on his cock as she rubbed her clit with panic. She had to cum before he finished! She had to! Within moments, she was there, and great waves of orgasm racked her, causing her cunt muscles to spasm almost painfully. She clamped her mouth shut and put a hand over it to muffle her moans of ecstasy. Sweat poured from her forehead and stung her eyes. Then, Rob was shooting into her again. Melinda could feel her step-brother's cock stiffen and swell to even greater size before it squirted hot liquid into her steamy cunt. Wave after wave pulsed into her, to be squeezed out of her dripping cunt every time he pistoned into her. It smeared across their thighs and her ass until they were sliding together in the slimy stuff. Melinda leaned back against him, exhausted. She heard him chuckle softly. "What a fuck," he mumbled into her back, and she could feel his cock shrink quickly, now that he was spent, allowing more of his slimy cum to trickle from her pussy. Melinda stood up, and his limp cock plopped against his hard tummy as it slipped from her hole. She reached down between her legs and got a couple of fingers full of their blended juices and slipped them into her mouth to suck them clean. She could see the slickness of their cum covering his upper thighs. Globs of it peeked from the hair around his cock. "G'night Rob," she whispered coyly. "I'm tired." Her step-brother shook his head as he stood, pulling his jockey's back up to cover his red, wilted cock. "Gawd, Mel," he said, still shaking his head, and quickly, but quietly left the room. Melinda pulled on a robe from her closet, and padded toward the door. She was going to have to take a shower to get this stuff off of her, she thought. As she opened the door and stepped into the hall, her stepfather, his back to her, reached the top of the stairway, then turned and leered at her lustily. She felt herself pale at his gaze, then blushed hotly. He licked his full lips wetly, then turned and walked down the stairs, leaving Melinda to slump back against the doorframe. What all had HE seen?