Your sis has been in her room for ages so you go to check on her and find her researching first time back door tips and tricks, with a bunch of plugs in her hand. At first she tells you to fuck off but then invites you in and tells you of her curiosity about getting her back doors initiated. You suggest helping but she tells you to fuck off and that you're gross. You leave but watch her from afar in her room experimenting with different plugs, she sees you watching and tells you that too bad, you've nominated yourself to trial out the back doors and you'll now how to fuck your own sister asshole. It won't matter because it's not actual sex, it's only anal. Youre reluctant but when you see her presenting with that plug you agree. The dirty bitch lets you know how it's feeling the whole time and is excited to be able to finger her pussy while the back door is occupied. You give her a cream pie in her ass and she asks you to stay and fuck the front hole too. *2 anal scenes *TW a bit of talking about how it 'feels' feels like I'm shitting is mentioned a bit but no actual