So this was a few years ago before we were married. My girlfriend was heading out with her sister and friends one night and went to her sister’s house to get ready after work. They all went out and had a great time.
Early the next morning she came home and soon as the key hit the door I was waiting to get some action. She came in and before I could get her pants off she confessed that she was wearing her sister’s thong. I was immediately hard as a rock! It was a black shear see through thong. I could see her beautiful labia right through it. I went down and licked her through her thong and she never questioned it. I think she knew this would turn me on and she was right! She was soaking wet. After a few mins she pulled it to the side and asked me to fuck her. I did as requested and it was awesome I cummed then she cummed. She then slipped her the thong back over so that my cum would leak all over it. We fell asleep and when we woke up a few hours later I rolled her over and fucked her doggie while also keeping the thong on. It was just super amazing sex. This happened a few more times that day with each better than the last. What blew my mind the most was how my girlfriend just knew what was going on in my head and just rolled with it. She knew what she was doing!!
About a week later she returned the thong to her sister after doing the wash. Man that is the part that still sticks with me to this day. Picturing her sister with that same thong on after what I did to her own sister in it that day! I still jerk off to this thought!