Hot Little Sister

I picked my 13yo sister up from school on friday and soon as she got in she said oh my underwear is showing I looked and she had her black knickers pulled to one side and was rubbing her finger up and down her hairless pussy and smiling at me I couldn't hide my excitement and she could see it to I drove as fast as i could to our auntie's house as i had her spare key we rushed in i asked her if she was sure and she told me im not her first i told her to keep her school uniform on and just take her underwear off she had her legs wide and her little pussy looked inviting I knew it was going to be tight so used a little drop of baby oil rubbed my dick up and down her pussy then pushed it in and didn't stop until she took it all i asked again if she was ok and she said she was then started fucking getting faster her moaning was enough for me to cum I was drained i rolled off catching my breath and she starts laughing saying i thought it would of lasted longer maybe next time you will i wasn't having that i got straight back to it i didn't care what sounds she would make i fucked her again hard when i cum again i knew i couldn't do it a third time she now wants me to pick her up again on monday.