Panty Wank

I had heard of men using panties to wank off into but the idea had never occurred to me until around a year ago. My wife's niece came to stay for a week over the summer holidays. She was mid teen, slim and attractive. I'm trying not to sound too pervy here but dressed in summer tee shirt, obviously no bra, short skirt etc it was hard not to look. My wife actually joked about it at one time and of course I denied it. One day, wife and her niece were going shopping leaving me at home to get on with some odd jobs. Just before they left my wife asked me to load the washing machine, set it going and she would sort it out om her return. Around five minutes later I went to get the laundry basket which didn't have much in so I started to load the machine. In the basket were several pairs of cotton panties, obviously not my wife's so must have been niece's. The panty wanking idea suddenly came back to me so I thought why not? In no time I got my stiffening cock out, wrapped the panties around the end and hurriedly jerked off into them. What an experience. I looked at the cum in them then thought that I'd better rinse them out which I did. I then put them into the machine and set it off. Later, my wife sorted it all out and I was glad to see that the panties were clean, no cum stains. I was worried but did it several other times.