Okay I feel compelled to share one of several snooping stories I have, after reading many of the posts on here I realize it isn't as weird as I feared
This happened about 25 years ago when I was about 25 years old. I had always been rather turned on by my (now ex) mother-in-law and her very impressive tits. She would have been about 45 then and they were the source of a great many bouts of masturbation, I could never take eyes off them. I don't think she did it on purpose but just about every blouse she wore was tight to the point that the buttons looked like they were really struggling to hold things together. She wasn't overweight and I think to be fair she struggled to get tops to fit properly. If they were quite thin you could often see the lacy pattern of her bra through them, something that I found a real turn on.
Anyway one night after rather a lot to drink me and my wife stayed over. She was pregnant at the time and so we were told to sleep in her parents bed and they slept in the guest room. As soon as my head hit the pillow I was out for the count. Then the following day I woke up to find I was alone in the bed and I could hear my wife and her parents all getting ready to go out. I didn't really fancy trailing around the shops and luckily they agreed that I should stay where I was and sleep my hangover off.
As soon as I heard the car pull away I decided to have a snoop through my mother-in-laws drawers. Rummaging through her fine lace underwear had my cock as hard as rock in no time. I even found a large rubber dildo at the back of the bottom drawer, something that has kept my imagination going until this very day. I sniffed and licked a few pairs of her knickers, (unfortunately any used ones were at that time spinning in the washing machine downstairs). Then I took a while to admire her selection of bras. black, white, red, pink, blue, all colours and all very very sexy, and very big, (cant believe I never actually took the time to check the size on the labels). Bearing in mind I had emptied my nuts countless times over those enormous jugs of hers I knew I had to make the most of this rare chance. I selected a very sexy white lace bra and taking two pillows off the bed managed to stuff one into each cup and fastened the bra up holding it all together. I then got back into bed with a pair of her silky knickers wrapped around my cock and began to squeeze and fondle her lovely lace bra imagining she was wearing it. I know it sounds ridiculous but at that moment I finally had my mother-in-laws tits in my hands. In just a matter of seconds I came so hard and drenched her knickers in so much spunk that I had no choice other than to throw them away. In fact it soaked right through and left a stain on the bed sheet. Don't know if she ever noticed it, but then I didn't care to be honest.