You start making your way through the group of waiting students, planning on encouraging some of your fellow classmates to look round more. However, as you reach the outer edge, you catch sight of one of the zoo's premiere exhibits - the lions. A lioness is gnawing on a large bone inside the glassed-off habitat.
Wow! She's beautiful! You go over and stare at the tawny beast, mesmerized and feeling incredibly horny. Too late you realize that your wish just said "One of the boys in my class..." YOU are one of the boys in your class! It should be simple to stop the desire, but you also wished for 'uncontrollable' desire. And guess what? You got your wish!
You move around the habitat, desperate to get in. There! You spy a section of wall that you can climb. People yell and grab for you as you scramble over the barrier, but you get over and drop down inside.
There are two females and one male here, and the male roars and prowls close, snarling at you. However, the spell seems to have also decided to make mating possible, for the female comes over and present herself, while the other two snarl and pace, but do not interfere.
You are already ripping of your clothes, and pause only a moment when you see the barbed, slick lion's cock push out of the furry sheath between your legs. Then you mount the lioness with a cry of pleasure that gets deeper and louder with each thrust. You climax with a thundering roar and slide off her back, fully a male lion!