Miranda's Panties

My mom's best friend has a really hot daughter named Miranda. She is four years older than me almost exactly. Her birthday is the day before mine. She's five foot six, shoulder length light brown hair, an olive skin complexion, beautiful smile, b cup boobs, and nice cute little round ass. I've spent many a time jerking it thinking about her. We were living out of state at the time but we came back for Christmas. We were staying with my moms best friend, her husband and Miranda (who had a boyfriend. Which is the only reason I didn't try to make a move on her.) We had exchanged gifts. The boyfriend had come over to celebrate too. At one point Miranda had squated down to do something and the back of her shirt went up while the back of her jeans went down.  That's when I got a glimpse of her panties. They were white cotton polka dotted Hanes panties. I've had a panty fetish for years so seeing this really drove me nuts.  Later on she had changed for bed and was wearing a long sleeve shirt and a pair of sleep pants that showed her ass off nicely. She bent over in front of sticking her butt up practically in my face spreading her legs. I stared at that butt for what seemed like hours. I could make out her panty lines including the seams on the crotch of her panties. I got so horny that I went to the bathroom and jerked it thinking about her panties and ass. I know if she had been naked I would've gotten a good look at not only that ass but her pussy too. The next morning I was the first one up. Or at least I thought I was. I noticed that Miranda had already gotten up and left. I went into her room and saw the sleep pants she had worn the night before. Underneath them wore the polka dotted panties. I picked them up and started examining them. I looked at the front then the back. I looked inside and saw the residue her pussy left behind in the cotton crotch part. I held them up to nose and breathed in deeply. The scent was so intoxicating and arousing. I lied down in her bed and pulled my sleep pants and underwear down exposing my hard cock. I put the panties on my face and started stroking.  I was breathing in her scent with every tug and thinking about her riding me. Watching those perky tits of her bouncing in my face. Just before I climaxed I grabbed her panties off my face and rubbed the inside all over the head of  my dick. I positioned the crotch part over the head and came hard into the fabric, trying not to scream.  Afterwards I put them back where I found them and simply went to back to bed. I don't know if she ever knew someone had jacked off using her panties but sometimes I like to jack thinking about her wearing those after I came in them.