I'll keep it short, and answer questions if there's interest.

>Close with sister
>one year younger than me
>she wants to experiment
>Shows me her pussy
>I almost eat it but get cold feet
>few years go by
>she's less all over me
>but does seem to be all over my friends
>start to notice my friends wanna come hang out at my place far more often
>realise too late what was going on.

Now furiously aroused by my sister, and how my friends have been using me to get between her legs and do what I couldn't.