For tonight she has picked out a slutty porn star outfit that she knows will turn him on, she is trying it on waiting for the erotic encounters to come. She is so excited that she takes out her phone to shoot some mind blowing pics of her sexy body. The leather collar hugs her neck and the pants are so tiny that tight ass is already hanging out even when she stands up straight. The idea of her boyfriend taking her with the leash has her turned on and she rolls around in her bed, shooting her sluttiest poses. She is concentrating so hard that she pushes the wrong button when sending pics to her boyfriend. She is shocked to see they all went to her stepbrother. He cannot believe what he is seeing on his phone and comes into the room with a bulge in his pants. Lilly is embarrassed but feels horny at the same time. Something in the way he is looking at her lets her know exactly what he is thinking. Overcome by desire to do something forbidden, she beckons him over and takes his cock from his pants. She slides her stepbrother's cock down her throat without a second thought. After getting it nice and wet, she bends over and lets him slip his long dick inside of her. She is so turned on that she cums in record time. He is a much better fuck than her boyfriend and she is so excited to get his load all over her face. That's a good turn in their family relationship and Lilly couldn't feel happier.