Panty Handjob

I was 15 and we had to stay with my mom's friend for a few weeks because my moms friend broke her leg in a accident so we were helping her out around the house. She has a daughter who was 16 at the time and super hot. Well one night I went to take a shower and on the bathroom floor were a pair of her daughters panties. I knew they were hers because she was in the shower before me. I picked them up and saw and felt how damp the crotch was. They were purple bikini style. By the time I got them all the up I was hard and sticking out the top of them. In my excitement I never locked the door and in she walked and saw me. She was silent and so was I for about a minute and a half. I just got harder knowing she was looking. She said that is so hot. She gave me my first hand job that night while I was wearing her panties and from then on she always borrowed me panties and gave me hand jobs when I was wearing her panties.