So, my wife is 29yo and has stacked it on over recent years she probably weighs the same as me (98kg). TBH I was never really attracted to her "hotness" or body anyway, she just had heaps of other qualities that I was attracted to. One thing led to another and before you know it, here we are married with baby and living the family life.
Now, here is where it gets interesting. Her sister is HOT, a real sexy little thing. 21yo, 50kgs and sexy as! When ever we go to her house and my wife leaves the room, goes to toilet or whatever, the sister always manages to find her way onto my lap. Now, I'm sure she is just being friendly but I'm easily, ummm "excited" so I normally bar up pretty quickly. To avoid embarrassment I'll make an excuse to get up and get a drink, or do something to get her off my lap before she gets impaled on my raging rajah.
Anyway, on Christmas Day, she sat on my lap and I didn't get up. I just sat there - she sat there. I got hard in about 0.06 seconds and I don't why but I gave the old fella bit of a "throb" and she felt it against her ass. I could tell by the way she practically grinded herself back onto it that she knew it was there. My wife comes back into the room and makes a light hearted comment about us two sitting there and the little sister says "Don't be a sicko, he's the big brother I always wanted". She hopped off, smilled and slinked away leaving me with an uncomfortably massive FAT in my pants!
On New Years Eve we were house sitting for her as she was going out with her friends. My wife went out to pick up Pizza and the sister came out of the shower with just a towel around her and asked if I could rub moisturiser on her back. She sat on the edge of the lounge with her back to me, opened her towel, holding it against her chest and lent forward so I could rub this shit on her. I could see her ass crack and everything - IT WAS AWESOME. Obviously I got a tremendously hard stiffy. She then said something like "I couldn't ask just
anyone to do this but you're like a brother so I don't mind".
When I was all done, she stood up reveleaing her totally tanned and naked back, ass and legs, and said "thanks" she looked back at me just as I was trying to "adjust" myself into a less dick breaking position. She giggled, looked down at my crotch and trotted off to get ready for her big night out. Soon after the wife arrives back and all's good.
So what is the go with this? She is hot and out of my league. How far would it go? Is she just an attention seeking whore? Is it just some sisterly rivalry thing going on? Does she really mean the "like a brother" comments? And if she does mean the "brother" comments, am I a total SICKO for having a sly wank this morning whilst totaly fixated on the "New Years Eve Moisturiser Incident"?

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