It was then that I realized he was watching me by watching my reflection off the various stainless steel appliances. When I was at the counter area I ...as bent over stocking the shelves and saw him watching my ass. By the reflection I could see he was touching his crotch through his pants. I have to confess that my dirty mind started whirling and I decided I did not mind him watching me. I deliberately did things to tease him, all the while enjoying the fact he thought he was doing it secretly.. "I then made a mad dash to the bathroom to take care of some internal pressure. While I was doing that Kim came in and turned on the shower. When it had warmed up she said "Dad, in an effort to save water we should shower together. We have to think about the environment you know." Yeah right! All I could do is groan and follow her into the shower. Our shower was another erotic experience soaping each other with special attention where we needed it. I brought her to a nice orgasm but having so. They were too concerned in humping than in talking, add that to his introverted mess and there you got the reason for short conversation.The movement was slow and every inch of body movement was deliberate, to conceal what they were doing. His dick rubbed her slit at his head continually rubbed her clit, as his breadth touched her neck. They were in ecstasy. At least it was Andrews for he never even got close to kissing.She moaned a lot but managed to decrease it to a few squeaks. She sighed. She is working in my company as a software engineer at senior level. As we studied in same school and college and now working at same company, we are more like a friend than siblings.This incident happened before 6 month when we planned weekend picnic with the office friends at dam site near Lonavala. As per planned, me and my sister reached at decided point we came to know that the picnic was canceled due to urgent office work. It was really shocking and we lost our mood. But we had no option..