I Have a Date with a Dominant Guy who Only Does Anal Asked My Stepbro to Help Me Prepare

Soo I have a date with a guys who said he wants me to be his personal submissive slave and he will only fuck me in the ass. I am not very experienced in either so I decided to ask my stepbrother to help me out! Gotta get him to stretch my ass a little bit and show me how to be a submissive BDSM girl. I don't want to disappoint my date!