Done this with my mom's panties. It happened during a trip with my friend, mom packed my clothes and by mistake put her blue jockey panties in my bag. My friend spotted a panties in my bag and asked how it happened. I was clueless and suspected it was moms as she packed my bag. I called her next day and asked if the blue jockey was hers, she laughed and said she is searching for it everywhere, just bring it back after your trip. My friend asked if he can have the panties, I told him that she knows it's with me. So he said can I wear it for a day and we will wash and dry it ( the conversation was more complex, I am just over simplifying it for saving time) . He wore it one day and probably shagged in it , washed and dried overnight, the next day I couldn't control the urge to wear it, my friend encouraged me and I wore it for a day. I had a hardon everytime I was conscious of it, in the evening I shagged in it and washed it. When I returned home and gave the bag to mom , I told her jockey is in the front pocket, she didn't look at me and walked away with the bag.