It was the ending to an incredibly long week. I had gone above and beyond in trying to fulfill others’ expectations of me. It was my time now, and a...l I wanted was a nice hot shower, something to eat and then time to relax and unwind. An hour or so later when I crawled into bed, you were sleeping so soundly and didn't even move as I snuggled up to you. I kissed your shoulder and neck gently, and then rolled back over to try to go to sleep. Honestly, sleep was not what I wanted right then. I had. Then I undressed me. Now both were completely nude.Then I lift her to the bedroom and started my foreplay. My target was the boobs. I played with her boobs for 5 minutes.After that slowly I had come down. Wow. It’s like a forest. First I kissed that spot then slowly inserted my finger into that. My sister is moaning as she is enjoying my moves. Then I did the same with my tongue.She wants to blowjob me. So, with my permission she blowjob me for 4 minutes like an expert.That moment I understood. He grinned, blushed, as she added, “Well, that remark isn't totally true, but you know what I mean?” She grinned at him and he caught her drift immediately, still grinning, still blushing. She told him she was going to get them something to drink and walked out to the kitchen while he was calculating and writing the estimate, telling him to be gentle with her. She had the iced tea pitcher chilled in the refrigerator along with some cold mugs that she filled with ice. She put them on the tray. "Despite the rather scattered explanation, I could tell she was reallytrying her best to give an impromptu lecture on a subject that shedefinitely wasn't prepared to speak about. I appreciated the effort, butat the moment, I didn't actually care about the Physics and to move theconversation along I nudged her by asking, "But what about this ManyWorlds thing?"She was starting to feel comfortable and smiled before grabbing a pieceof chalk and turning to the board. "Well, there was this.