Desperate StepSister Gets Ruined

My boyfriend, in an attempt to get rich, messed with the wrong people and we desperately need money. He suggests I ask my step-brother for help but I can’t do that! I have been so mean to him! I agree to talk to him - he’s hesitant but agrees under one condition; he would like to make me his sex slave. I laugh at that idea but after talking it through with my boyfriend, I make the deal. My step-brother wants to use me immediately. He has me strip for him in the bathroom which makes me so embarrassed and mad - not even mentioning the fact that my boyfriend has to watch. In no time, I am already sucking my step-brother’s cock and he’s facefucking me. I feel out of place and only want this to end. I constantly check with my boyfriend to see if he’s okay. In spite of that I can’t help but notice that my step-brother’s cock is huge. Now the rough part begins. He starts to fuck me and he has no mercy. He makes sure to fuck me right - my boyfriend has never treated me like that. He pushes me into the shower and shoves his cock inside my ass. That hurts! I have never done that before! I am not sure what causes it but I cum hard. He fills my asshole with cum and I try to explain to my boyfriend that this is not what he thinks. When I am happy that this is finally over, my step-brother has different plans. He gives my boyfriend the money and tells him to leave.
The next day, I am dressed up all nice. I still can’t believe I am trying to be sexy for my step-brother. I start dancing which is super awkward but when I notice how hard it gets him, I get into it more and more. He shoves me onto the bed and starts fucking my ass. I am speechless for a second but I tell him to use me right! Just like he wants to! I want it! I want my step-brother’s cock. He fucks me, I blow him, he fucks my again. He cums in my pussy and the thought I could get pregnant has me dripping. I want to try his cock again now and just as I get into it, my boyfriend visits. He says it’s all taken care of and we can go back home. Well, honey, just a bit more. I have some unfinished business. My step-brother cums in my mouth and I belong to him and to him only. He tastes so good. We go back to bed and I ride him with my ass. I switch to mouth a few times to show my boyfriend things he has never done with me. I cuckold him again since my step-brother loves it so much. He fills my ass again and I wave my boyfriend goodbye while kissing my new love - the only right one.