Mark took a swig of the baboon vial. He set it down when he suddenly felt a churning in his guts, he fell to the ground in agony as fur raced across him, even covering his penis. Mark saw his limbs almost stretch, fingers and feet lengthening until they could grip with ease. With shock he saw his legs crumple, bending over and twisting until he could only walk on fours, his knuckles broadening to accommodate it. Short brown fur now covered everything, except his ass, which broadened into a bright, red, shiny thing that pointed up in the air. He felt wind pass over it...wait wind? Turning around he saw he was teleported to the African savannah, a group of baboons already in front of him watching. Soon his muzzle grew, gaining sharp yellow fangs and beady eyes. Mark felt his mind slipping as he felt his skull tighten inwards, his last changes completing as his skin became a leathery brown and his dick grew enormously gaining a musky odor as he lost all memories of his past life while his brain smoothened to a more basic form. The new baboon soon eyed a female in the group. His ass in the air he began to court her, the others watching as she accepted his display. Grunting he mounted her, his tail almost intertwining with hers. The thrusts soon grew more intense, to the point where both began hooting and shrieking in pleasure. The fur around her pussy is sopping wet near the end, the female hooting as he savagely thrusts his unsheathed penis into her. Soon he releases his load, as cum streams into her both shudder as they climax. The new baboon then lays about lazily in the sun, now truly a part of their group as he strokes his mate's nipples.