I don't think it's appropriate for kids to sleep with their step-parents. And a new boyfriend isn't a step-parent. Your son isn't an infant who's unaware who he's sleeping with, beyond the mom who's breastfeeding him. He's five. You're behaving as though there's a level of intimacy between your son and your boyfriend that truly only exists between YOU and your boyfriend.
12/19/12 at 6:47pm