You're normal -- he's not, he's a creep and should be reported if he indicates he wants to watch you. There's no "step" father in the Bible, he's your father! Illegal, unnatural and perverted! Everyone likes younger women, but not your daughter.
....unless you like kinky.
....and perverted and illegal. It'll get him twenty years!
He must have interest in you or wants to touch you... beware of him. He is not your real father. keep your room lock and do what you want....!
he will surely asks you to see you...!
YOUR STEPFATHER SHOULDN'T BE WATCHING YOU THAT'S CREEPY
Well, you should tell your mom because he should not be watching you. Tell your mom or a trusted adault because no body should watch you, and if they do find you doing it then they should leave the room until you come out I think. so please tell an adualt.
Other people will think that thinking of your parents while touching your self is gross and weird and you shouldn't do it but I do it alot. I think it is normal. I do not love my parents in that way and I would never actually do it with them. But I just like it.