You

Amanda spins the dildo and it lands on you she smiles and says "hurry up bro I hope we get a good one" you reach and pull a card it says backdoor explorer "card holder must perform anal on the spinner until one of them climax".

You look at your sister as she pulls her panties down and reveals her sexy round ass she sucks on her fingers until they're dripping with saliva then she rubs them on her asshole until she can slip her fingers in.

Amanda looks back at you and ask "so big bro are we doing this or what