Note: This story was dynamically reformatted for online reading convenience. Michael couldn't believe that he had managed to make his step sister strip for her spanking. He felt ready to explode as he stared at her entire nude body. She had very pale skin, and the whole embarrassment of the situation had left a red rash on her face and across the top of her chest down to the start of her breasts. Her breasts were small but perfectly shaped. Light pink nipples with large aureole on snow white mounds. His eyes traveled down her stomach noting the ever so small soft look pot belly, down to the triangle of her pubic hair framed by snow white plump thighs. He stared for what seemed like ages, but in fact was probably about 30 seconds. Sarah, then with a tremble in her quite voice said 'Mike, please, just do this and get it over with'. 'Come over hear and bend over my knee' Sarah, walked over to Mike, and as she did so noticed the distinct bulge in his shorts. She had of course known that there was a sexual aspect to all of this, and her own body was betraying her in the same way as she felt the moistness in her pussy, however this confirmation made her even more scared and keen to get the spanking finished. This whole situation felt just wrong. She draped herself over her brother's knees acutely aware of the fact that Mike was about to touch her naked bottom. Mike then asked her to push herself further over his knee. Both knew that would leave her even more exposed! As Mike suggested this he touched his sister for the first time to help her move into the position he wanted. The first touch of his hands on her soft warm skin almost made him cum on the spot. As she shifted across, one of his hands touched the outside of one of her breasts, and for a fleeting second he brushed one her nipples. He genuinely had not wanted to do this, but the moment sent him into an even higher state of arousal. Once she was in position he looked down at his naked step sister's buttocks, pussy lips clearly on display. Strange as it was he wasn't too sure where to put his hands, but pushed past any reservations now that he had gone this far and rested his right hand on his sisters buttocks. The feel of their plump softness, the fact that his fingers were a couple of inches away from her naked pussy, and the sheer humiliation that he was putting her through raged through Mikes mind. Sara was mortified, but the more humiliated she felt the more powerful the throbbing that came from her sex. She knew what he was looking at, and she was terrified of how she was responding. 'Please, just get it over with!' Mike raised his hand SPANK! SPANK! SPANK! The spanking was harder than their mother had given, and Sarah gasped at the pain which mingled confusingly with the pleasure she felt. SPANK! SPANK! As Michael spanked his sister he watched her buttocks jiggle and turn red. He could feel her upper body moving as she jerked around from the spanking and moved his left hand to nearer her breast so that it rubbed against it. Knowing that his sister couldn't help noticing despite the pain of the spanking, he felt he couldn't help himself as he curled his hand up to cup his step sister's small soft breast. Her nipple was hard and the breast was incredibly soft with skin that felt as smooth as silk. He knew he should stop but somehow felt compelled to massage her soft breast in his hand as he continued to smack her naked bottom. He was wearing a thin pair of shorts and as he spanked her the rhythmic movement of her body was causing them to rub against his cock, driving him closer and closer to cuming. Sarah knew she was losing control. The spanking seemed to go on for ever, and the throbbing from her sex was getting stronger and stronger. The humiliation of having her bottom smacked like a naughty little girl, the fact that her brother was ogling and touching her naked body, all of these thing drove her nearer to orgasm. She decided to give in. If he wanted to look at her body, let him. With that she opened her legs wide, knowing and wanting that her brother would be able to now look fully at her exposed pussy. This was too much for Mike, and as he explosively came he gripped one of his sister's buttocks and let one finger dip into her pussy. And then it was over, for a couple of seconds there was silence and then Michael, barely able to talk said 'I think that's enough' Sarah jumped off his lap and ran upstairs still naked with tears streaming down her face. Michael was shocked at what he had just done. He thought that he had ruined his relationship with his sister forever. He cleaned himself up and looked over at the discarded swimming costume that he had forced his sister to remove. He decided that he had to try and sort things out immediately or would lose his nerve, and with that went up to his sister's room to try and achieve the impossible by putting things back the way they should be. To this day Mike doesn't know why he didn't knock, maybe it was the fact that he had already seen everything his sister had already, maybe it was because he was panicking, whatever the reason he just walked into his sister's room and started to talk. 'Sarah, look I feel terrible, I ........' And then he stopped. In front of him, his sister was lying on the bed completely naked. Her legs were open wide and she was furiously masturbating and right at the very moment he had come in was in the throws of a violent orgasm. For some reason the fact that her buttocks were still bright red from the spanking is the thing that sticks in Mike mind the most. 'Get OUT!' Mike left immediately, however he now knew that just as his mother spanking his sister had awoken something in him, the same feelings had been awoken in his sister. His cock twitched again as he thought of the opportunities that this could have in the next few months. Things were never going to be the same again.