Shawn tried to roll over when he woke up, but he found that he couldn't move. His arm was pinned down by his girlfriend, Wendy. It had been a rough night and Shawn didn't remember it to well. He had one of the worst hangovers. He looked at his girlfriend's bare back; her skin was so smooth and tan. He didn't know if they had had sex last night, so he asked. Wendy stirred a little and rolled over pulling the sheets over her breasts.
"No. We were going to, but you were out cold almost immediately. I couldn't drive home I was too drunk so I stayed," she responded groggily. Wendy leaned in and kissed him. Now that she was awake she got out of bed. She started to get dressed. Wendy was standing there in her shorts and a bra when the door opened. It was Libby.
"Hey Shawn, Mom has got break...Oh my God," the door shut almost as quickly as it opened. Wendy put her shirt on and went to the door. She opened it and told Libby it was ok to come in.
Libby said to Wendy, "I am so, so sorry I didn't realize you were here."
"It's ok don't worry about it," Wendy said.
Now looking at Shawn Libby went back to saying what she was going to tell him, "Mom has got breakfast ready if you want to come eat," she turned back to Wendy I'm sure you can come too.
Wendy responded, "Thanks but I have to go home and get ready for work."
Shawn got out of bed he hadn't realized he was naked until it was too late. He jumped back in bed under the cover. Wendy walked over to the end of the bed and threw his boxers to him. Libby had this shocked look on her face as she walked out of the bed room.
After Shawn got dressed he walked Wendy to her car. He gave her a kiss and they hugged. When she had left he went in and ate breakfast.
It was a nice Saturday morning and the sun was coming up. After breakfast, Libby asked Shawn to come and talk to him.
"I thought you were going to break up with her to be with me?" Libby said angrily.
Shawn pulled her close to him and hugged her warmly. With out letting go he told her, "I can only be with you here in private. Do you seriously think that it would be ok with anyone for us to kiss in public? I love you very much, but it isn't possible for us to be in a relationship other than the one we have now."
"I just get so jealous when I see her naked in your room," said Libby.
"I know," was all he said.
Later that evening their parent went to a party and left the house to them. Wendy dropped by about nine o'clock. Shawn and Wendy went back to his room. Almost immediately Wendy pushed him to the bed, and jumped on him. She straddled him and unbuttoned her shirt. Her breasts were about to pop out of her bra. She leaned down and started kissing his neck. He ran his hand up her back and took her bra off her tits were beautiful they were a perfect round C cup.
He sat up. She was still on top of him, so he buried his face in her cleavage. He looked at her in the face and stood up holding on to her. He turned around and laid her down on the bed, he reached up her skirt, and pulled her panties down. She sat up on the bed and grabbed his zipper. Within a few seconds Wendy was tearing away at his cock. She was giving him one hell of a blowjob. After he came she swallowed his cum.
He pulled his shirt over his head and dropped his pants to the floor followed by his boxers. He climbed on top of her and slid his cock into her dripping cunt. She let out a loud shriek of pleasure.
Libby hadn't realized that Wendy was there until she heard that. She quietly walked to his door and opened the door so slightly that Shawn and Wendy didn't notice. She peered in through the crack in the door. She could see her brother pounding away at his girlfriend. She was moaning like a bitch in heat. Libby was disgusted but turned on. All she could think of at that moment was the amazing sex that her brother and she had had two weekends ago. She put her hand down her shorts and began to finger herself while watching her lover fuck another girl. She started imagining that it was her instead. She so wanted to ride his cock again.
Somehow Shawn had noticed his door was open and saw his little sister finger fucking her self watching them. It made him even hornier. He slammed in and out of his girlfriend even harder. They all came about the same time. Wendy never noticed Libby. Shawn rolled over and closed his eyes. Wendy rolled over and put her arm across his chest as she went to sleep. Libby quietly closed the door and went to her room to go to sleep.
The next day Shawn got out of bed without waking his sleeping girlfriend. He sneaked around the hall to his sister's room he slowly opened the door and closed it after he was in the room. Libby was sound asleep.