Before Tim could confess to his secret desire for rodent ladies, Kyle let out a gut-wrenching yell that startled the other two.
Kyle grabbed at his shorts- just to grab at anything- as the changes overtook him. Pulling his shorts so tight only made the bulge at the back more prominent though as Mark could see something stirring beneath.
"Oh god, it hurts," Kyle said with a sweat pouring down his face. Just then, there was a tearing noise as his shorts gave out and a long, ropey rat's tail unfurled behind.
Tim's eyes met Kyle's for a moment when his face took on its new form. His eyes got bigger and dark while his face pushed out and sprouted whiskers. Kyle tried to cry out but his voice was a raspy echo. In his mouth, Tim could see his teeth changing and reshaping while his nose took the shape of his new species. His pointed ears were poking through a longer growth of hair on his head, a dark brown, which contrasted the lighter color fur that was sprouting up all over him.
Kyle fell onto his side as the rest of his body burned with magic. The nice pair of shoes he had on tore as his new, longer and clawed feet outgrew the tight confines. His legs thinned and took on the fur of the rest of him. The tatters of his shorts gave no modesty to his shrinking cock and balls which disappeared in a slit that soon was itself covered by a fine grain of fur. It was that, plus the large, fleshy orbs now adorning his friend's chest that made Tim's own cock get a lot harder.
As Kyle let out a whimper, a sweet, feminine one, that changes subsided and where was once a dorky teenager was now a buxom rat girl.