Step-Mommy told you that you have to play with me, but step-brothers aren't good at playing dolls! I try to teach you, but it's no use, you're just a gross boy.
Well, if you can't play dolls, you should just be a doll for me to play with!
Oh, don't argue. You have to play with me, remember? And now I want to play House - with you as my baby! First things first, a baby outfit. I dress you up in a pink dress, bonnet, and frilly plastic pants to go over your diaper. You're my babydoll now, so what I say goes! Next, I feed you a bottle of pretend milk. Your diaper gets wet immediately, so I do what any good step-mommy would: set you up on the changing table and change your diaper! I get a thick, pink one and continue to baby you as I tape it around you tight.
Much better! What a sweet step-brother - you're the best at playing House!