I have been sniffing my sister-in-law's panties for the past 16 years and have many a story to tell. Unfortunately my SIL is a very clean person and her panties have never had much smell about them. That is why about 4 years ago I started to lick them as well as sniff them, but she does not have much discharge either and when there is some I make the most of it.
One of the most memorable times was about three years ago when she and her husband came to stay overnight unexpectedly. They turned up at about 6pm on a Wednesday evening. My SIL often likes to get into her night clothes early when they stay over and this was no exception. She always changes her panties when she puts her pyjamas on so I know I will usually get some to sniff. This evening she went to change almost as soon as she set foot in the door which was a little strange. I waited until she had finished and then I said I had some work to do on the computer which happens to be in the same bedroom as they sleep. As soon as I got in the room I looked in the overnight bag and removed a little white thong, still warm to the touch. When is looked in the crotch I could see why she had wanted to change so quickly. It was full of white sticky discharge, the most I had ever seen in her panties. I immediately sniffed it but as usual it had little smell to it, but I knew it was not her husbands cum, so I decided I would have a taste. I put my tongue slowly to it and had a lick. It was still warm. This made me get very excited knowing I was licking juices that had come from my SIL's pussy in the last few minutes. I got my cock out and began to wank as I licked the stuff from the crotch. I knew I was going to come soon so I stuffed the whole crotch in my mouth and just sucked on the juices until at last I came. I removed the panties from my mouth and examined the crotch, which was now clean of all the discharge and was only wet with my saliva.
I did my work on the computer but had another lick and wank before I went down stairs to join the others.