[MF] walking in on my sister ( 19 ) and staying

To start there is a 6year age gap with me and my sister, me being the older one. My sister has a slim figure with a bubble butt and handfull size breast. My sister has never been a crazying party girl. All throughout highschool shes been a good student working hard to get into college. Shes really only ever hung out with female friends and never brought home a boyfriend or ever even mentioned one.

Shes been such a girl throughout her life never getting into trouble that when my partents decided to go on a 2 week vacation, they had no problem leaving her alone asking me only to check up on her once a week to make sure she wasnt to lonely. They told her she could have friends over to study but no praties.