FUTA GIRL

Damn.. your girlfriends step-sister is so fucking cute! You sit and watch her play Spyro whilst your girlfriend is upstairs getting ready for your date night and introduce yourself as her new boyfriend.. she smiles and says she's called Sydney.. but your girlfriend told you it was her step-brother that was called Sydney.. thats strange.. you never even realised your girlfriend had a younger step-Sister.. you follow her to the kitchen and dig a bit.. ask a few questions and she becomes guarded.. do you make her feel uncomfortable? Your girlfriend calls you from upstairs and says she has to go out for a bit to help her friend, but she'll be back soon. You sneak around to look for Sydney again and find her in her bedroom, looking at herself in the mirror.. she seems upset.. why? Suddenly, she pulls out this huge erect cock she had hiding under her sweat pants and starts to masturbate.. then she catches you looking and runs away.. You find her sitting on the sofa.. embarrassed that you saw her for what she really is.. you reassure her that you don't care and that you won't tell anyone.. you promise.. she is so timid and nervous.. but you can see the outline of her dick pressing against the fabric of her bottoms and it makes you.. hard.. jesus christ why on earth are you getting hard for this girl.. this girl with a cock.. its not even your THING but.. but.. something about the way she looks at you.. something about the way she invites you with her eyes.. her smile.. her wicked laugh and her petite body.. you WANT to experience something with her behind your girlfriends back.. and when she tells you she's never had sex before, that makes you all the more horny for her ass.. she begs you to fuck her like a good girl and as you slide your hard cock inside of her you can't believe how fucking tight she is.. her rock hard dick desperate to cum alongside yours.. she uses her ass to milk all the cum from your cock before showing off some impressive skills and sucking herself off in front of you until she cums in her own mouth and swallows it all.. can you keep this secret? I won't tell if you won't...