Sia was still recovering from major surgery. Better safe than sorry.Sia was gone by the time I finished my shower. Despite my worries about her tiring...herself and still needing time to recover, she insisted she have her friends over, so Saturday was a house filled with music and laughter and giggles.That night, Sia was seriously exhausted. She could barely keep her eyes open through dinner but was awake enough to sniff her food and decide she didn’t like Brussels sprouts, just like she hadn’t. “Hey Jeff, whatcha doin?” she asked.I just looked back at her, slightly annoyed. “Nothing, just browsing.”“Same place as last time?” she responded with a slight smirk.“No!” I retorted. “Did you need something?”She looked at me for a minute. I could tell there was something on her mind.Then she said, “There’s a cool website you might like. That’s all.”I really didn’t know what to expect. With a smile from my sister, those brown eyes and her devilish smile, I gave in to her wishes.I closed out my. She was already soaked. My finger slid effortlessly into her wet cunt. As I finger fucked her she leaned over so she could put Marvin's cock in her mouth. This exposed her ass and pussy to me at a better angle. I inserted a second finger in her and with my other hand played with her asshole. She moaned out load and said "oooohh, you kinky fucker!" Marvin and Felicia swapped positions and she sucked my cock. Marvin positioned himself next to me so I could suck his cock. It was the. I am not a dance guy but she insisted. I couldn’t let her go alone in this condition. So, I joined her and we were dancing like a couple, holding hands.Suddenly, my girlfriend turned her back toward me and started rubbing her ass against me. She even pulled her dress up a bit and was touching my cock.My dick had become a bit hard with all this endeavor and with her hands over my jeans. I had to control her from not exposing much of herself while she was drunk. So, I thought of going to a hotel.