As you feel her spirit float through your body, the rest of your worries and cares simply seem to float away. You feel something fundamental inside you changing, but you can't seem to work up the effort to care.
Your body begins to change. You can feel it start with your penis as it begins to grow uncontrollably, fur sprouting and streaking along it as it reaches your body. Your skin stretches out and forms a sheath, and the fur continues to spread along your body.
As the fur reaches your legs, your knees reverse and your feet become digitgrade paws, with claws turning into nails and huge muscles sprouting all over your legs. Your feet burst from your socks and shoes, shattering fabric. The fur continues to spread along your chest and back, and muscles sprout up there as well as you grow larger and larger.
Stopping shy at your neck, the fur shoots down through your arms, adding muscles and claws like they did with the feet. Your fingers lose a little bit of their articulation, but not much as the pads on your hands and feet grow in. Your shirt is torn to shreds by your rapid growth.
Finally, the fur reaches your head. You somewhat belatedly realize that you haven't been too worried about all this as you begin to grow fangs and a muzzle. Your ears begin moving up along your head as you blink your new feline eyes. Your mind begins to feel a sense of overwhelming power as you look down at your new 9 foot extremely strong half-tiger body.