I went back to my room to use my computer, and by the time, they should be back. A few hours passed, mom and sis returned a few hours later at 2pm. Th...y took a shower and came back. Mom and sis bought lunch for me and I ate it all up, considering I haven't ate for 6 hours. After eating, I decided to go to the bathroom for another "shower". I took a new pair of boxers and shorts, then went into the bathroom. I dug around the basket to find my sister's panties. I took it out, and took a sniff. I. “Slow down son, the idea is not to see how quickly you can cum, but to see how long you can make it last.”Rob pulled his hands from his reddening prick and Susie quickly replaced his hands with hers.“Take it slow, Susie,” I advised. “Don’t make him cum too quickly.”Susie replied, “If he’s like his dad, I am sure he can cum three or four times in one evening. How about that,” she asked Rob, “are you good for more than one cum?”“I’ve cum five times in a row,” Rob bragged. “Go ahead and make me. She spread her legs wide so her hand could move freely up and down over her pussy lips, and then she slid her hand underneath the waistband of her thong and let her fingers graze over her erect clit while her other hand slide upward over her belly and she found her erect right nipple where her bra cup had slid off her breast when she'd undone it. She circled the aureola of her tit first, just avoiding touching her nipple and that made it all that much harder. Then as her fingers were playing. I lifted her face and placed a lip to lip kiss to her. She doesn’t resist to it then again I kissed her on the lips for a long time for which she responded also. One day I got a call from her that she is alone in her office and feeling bore as everybody is busy in income tax office so I said can I come over as I don’t have any work to do and we will have lunch together. She said ok and I went to her office. She was sitting alone in the office I knocked the door and she let me in. Seeing her.