Step-Sister posing naked

Step-brother texted me with an unusual request for help. He said he needed to do some work for his art school (art school? wtf?) and asked me to pose naked for this work. He was so desperate and he said it was so urgent I agreed on doing it for him on my conditions. Yeah, it was really weird to get naked in front of my step-brother, but everything started more or less ok until i realized this fucker just tricked me with this painting classes bullshit to see me naked! He can’t fucking paint and he was stroking it behind the canvas! I was so fucking mad I wanted to destroy him! And i ended up falling on him. All naked, yeah..