In a typical "green-apple-moment", we see 12 yo boy play with a sprinkler, then removing his trunks to dry them a bit, and teasing his parents who have just stopped making love.
Pablo goes to a lake with Paco and undresses to his underwear for a swim. After he comes out from the water, he stands in front of the man, removes down his boxers and wrings the water out from it to get his attention, then lies down on his towel next to him and lies there naked for a while. Brief rear and frontal view.