For a couple of weeks during the summer holidays, Mom and Dad go to the States with another couple, and all the kids except Jack are billeted with friends and relatives. The other couple have a daughter about Jack's age, home alone like he is. She's one of his barn mates, so they eat together, play together, and even take turns sleeping over, playing house in every way.
Rosa is a little shy, so she keeps her brassiere and panties on at night, but Jack sleeps totally naked, holding her, close as two people can be. It's great!
One evening as he heads for the bathroom and he's standing at the top of the stairs, he sees the bedroom light magnifying his shadow on the far wall. It makes his erection look enormous. He calls her attention to this, and soon he is making a game of it, bouncing around, making grotesque shadow images on the wall. He invites her to see what she can do but, demurely, she declines.
They help each other with mutual chores, and for simplicity they mostly eat sour milk porridge. This is how natural whole milk can be used when it's left to sit, and becomes a colloidal suspension, jelly like. If you beat it with a mixer or egg beater at this point, and add brown sugar, it tastes not bad at all, and it's a nice cool summer food. With everyone away, they have a lot of milk, so this helps for that too. It's easier than putting it all through the cream separator.