A few nights ago, during S-O's bedtime routine:
S-O: Why can't I sleep in your bed with you and Daddy.
me: Because you have your bed and Daddy and I have ours.
S-O: Why do you sleep with Daddy?
me: Because he is my husband and we love each other, so we sleep together.
S-O: I love you and Daddy. Can't I sleep in ya'lls bed? I don't want to sleep by myself.
me: No. When you grow up and have your own husband, he can sleep in your bed with you.
S-O: I have an idea. When I grow up and get a husband, you can sleep in my bed with my husband and I'll sleep in your bed.