Fucking the stepsister who masturbates all the time

The boy finds the stepsister masturbating on several occasions. The girl is clearly very horny and needs to be relieved. The stepbrother offers her his dick and she grabs it and jerks off, getting horny. She gives him a blowjob and the boy stops her before he ejaculates. A few days later the stepsister grabs his dick and jerks him off, to give him a blow job again and then turn around and let the boy fuck her. The boy fucks her hard until she ejaculates into the pussy. Then the guy when he's horny looks for her to fuck and she can't resist