Not until you give me back the remote! I suggest the direct approach and it is going to be super awkward but worth it in the long run.
Sometime's it can be funny, other times not.
I understand that happens, he's a boy after all, but I'm his sister? There should absolutely be a discussion with your step-brother about sexual boundaries, especially with children.
But even if you're gay or bisexual, I'll still love you no matter what.
Because if my sister sat on my lap or anything like that, it's as though a guy was in her place I'm straight, btw , which means that there's no thought or reaction.
Consider that you represent a stable, safe, and trusted presence to him.