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I love playing dress up. When I get home from school the first thing I do is try on all my cute costumes and outfits. I always wear my favorite sexy underwear and of course my butt plug. I already learned about the incredible health benefits of semen. Specifically when administered rectally semen can absorb into your body and it has all sorts of positive effects! It really helps me think clearly too. When I hear my big step-bro come home I immediately call for him to come and help me. He is very generous with his semen and loves to share. His cock is huge today! I suck on it greedily, slurping loudly as I try to push it down my throat. Then he takes out my butt plug and replaces it with his cock. I'm so happy and excited I can't stop smiling and laughing. He strokes deeply into my asshole massaging and milking his cock for maximum cum volume. Changing to a doggy position he fucks harder and deeper, thrusting himself into me. My little butt stretched tightly around his massive cock. I know my reward is coming and I'm very excited to receive it! He pulls out blasting two big streams on cum across my butt before quickly pushing himself back inside balls deep to continue cumming. It feels like a liter in there, and he quickly replaces his cock with my butt plug to lock the semen inside where it will stay until his next deposit.