Room that looks like tent

So I wanna make a build where there’s a teen who gets pregnant and she has to hide the baby and I’m planning to have her get the trellises and have them lead onto the roof but I don’t want the baby outside obviously

Is there a reason there could be like a small room on top of a house? Or maybe an item or object I could use to cover it so it looks like a regular hangout zone on top of a roof?