A few years ago, my wife walked in on my jerking off while sniffing her panties. At first, I froze, but then she told me to keep going. She said she figured it out when she would do laundry and find my cum in her underwear, but never realized I smelled them; she only thought I jerked off into them. After that, she would make sure to leave used pairs on top of the laundry hamper or would leave her gym thongs on my pillow. When I traveled for work, she would put a pair or two in a zip loc bag in my luggage.
Then a few months ago a girlfriend of hers was having a big remodel done to her house, and we let her stay in our guest room for three weeks. She used the guest bathroom, and there was no need for me to go into either room, except on cleaning day. The first time I saw a thong hanging on a towel hook. Then, I saw a pair on the floor a few days later. I was intrigued but resisted the urge.
The next week they were on the towel hook again, but now there was a post-it note on the door with a smile. I mentioned it to my wife, and she just giggled. She said that they had gotten into a bottle of wine early in the friend's stay, and my wife mentioned my habit. The friend said "I'll leave him some treats", but was trying to be subtle.
The next day, the friend got home from the gym after work and just left her panties on the outside door knob. At that point, I knew I was welcome and grabbed them. I didn't cum in them, but god did they smell good; just pure pussy and sweat. I left them on top of her laundry basket afterward, and then every day there was a new pair hanging on her door knob. When she moved back to her house, a pink lacy thong was left on her pillow
.My wife proceeded to give me a blow job while I sniffed her friend's used panties, and let me cum in them when I finished.