My stepsister comes into my room to lend me my PC but she finds me masturbating, she acts like she doesn't see me

My stepsister enters my room without permission but I was masturbating if she saw me but she pretended not to be a bitch, she lent me the computer and turned her back to me so I couldn't resist her beautiful ass and I started masturbating again When she feels the vibrations of the bed she already knows what I'm doing so I seduce her to fuck her by sucking her delicious ass, and she ends up climbing on my cock, I want her to feel all the semen running through her mouth.