Possible Clues:

• Making oneself at home with the pain, at last
• With pains at last to be making oneself at home
• Making for home with a pain in the tail
• Making for home may be painful in the end
• Building a tree house?
• Fitting one within another
• One lacking love and pain, sitting in a home
• Fitting one inside the other
• Making a place in which to lay eggs
• Instinctive behavior for a mother-to-be