Back in the summer my parents went away for the weekend leaving me to look after my step sister Amy who is 14. I had been checking her out since she turned 13 as she was growing in all the right places.
Friday night my parents left, Amy was sprawled on the sofa still in her school uniform giving me flashes of her green panties every time she moved on the sofa, by 10 o clock I had a raging hard on and went to the loo for a wank. Saturday morning Amy had riding lessons and I almost creamed myself when she came into the lounge to wait for her friend, her tight riding jodhpurs were almost spray on and the lines from her panties cut across her cute ass.
Her friend Jenny arrived and they went to her room giggling and talking. 10 minutes later Amy came out saying Jenny had left her jodhpurs behind and could she call her mum. Jenny called but her mum wasn't in so Amy said she could borrow some of her old ones but they might be a bit tight. A while later both girls emerged from Amy's room and I went stiff as a poker, I could make out the shape of my step sisters nipples under her vest and the jodhpurs Jenny had on were so tight they rode right up her slit and showed her panty line completely, I quickly went to get the car to try and hide my boner.
After dropping the girls off I went back home and later that day they returned looking even more horny as they wandered off down the hall, my cock sprang into life looking at their cute bums encased in the tight material. Minutes later they both burst out of Amy's room wrapped in towels and headed for the shower, later they headed off to get the bus into town. As I walked down the hall I passed Amy's room and looked in, bundled in the corner was all their gear from riding and as I walked over I could see the riding jodhpurs rolled inside out and the girls panties still wrapped in them.
Picking up both sets, one had blue panties wrapped around the legs and the other pale yellow, I examined both pairs and the crotch of each was wet and sticky and some of the wetness had seeped into the jodhpurs. I smelled both pairs and a mixture of horse, leather and warm pussy filled my nostrils, I dropped my shorts and unwrapped both sets of panties, they were small, size 6 and the crotch of each soaked with juice. I wrapped one around my cock and smelled the other as I stroked off soon filling the crotch with gobs of my cum as I dreamed of their sweat pussies rubbing the saddle and the panty crotch riding up.