Tarzan swings for what seems like a very long time. You can guess that the hunters are very far away from you both. Tarzan slows down and you can feel the Lord Of The Apes jumping in order to get down from the tall heights he was within.
Alas, as he reaches the ground, the shock of that last jump makes the phial that had reduced you fall into his loincloth, along with some other dry powdery substances. They are dry but the phial contained a few drops, quickly swallowed by the sand-like contents of the leather pouches that Tarzan had. The drops touched Tarzan before being absorbed, touching the ape man's pubic hair. The powders cover you, before falling through the loincloth and spreading on the ground, following the laws of gravity. You sneeze, your nose greatly scratchy from that dusty substance. You feel itchy too, in spite of your thick fur. Tarzan feels the accident too, as he screeches. He starts scratching his pubic area fiercely. You avoid his fingers easily but the movement just induces more sweat and you get hist in the face by Tarzan's penis, which is massive at the moment! You scowl in disgust. You are stuck amongst the pubic hair of a guy!
But then you understand that the disgusting penis is getting smaller. You think that you might be getting bigger at last, but from Tarzan's frightened gasps you realize that it is the opposite. Tarzan is shrinking! The loincloth slumps and falls around you, with the pouches and the phial. Tarzan is naked next to you, and the powder upon you shines. You get taller, but not by much. Tarzan and you are now one foot tall. But the worst is yet to come. The powders covering you might still hold magic. Thanks to your size, you soon are both about to be treated as babies...