You twist a little and see you're inside a cave - obviously the lion's den - and there's sun streaming into the entrance a couple yards away. While moving to see that, you rubbed against something stiff that raked through your body hair. A moment's thought tells you it was the lion's member and you quickly twist back to look. Of course your own body is in the way where the lion's isn't, being so close together, but the movement confirmed it anyway. The lion's erect.
Whatever your reaction to that is, he's still asleep and you decided to try to see a little more before it wakes. You aren't completely lion yet, although you can still sort of feel change happening. You apparently have a tail and longer feet, even with retracted nails you aren't sure how to use yet, but after moving them a little it feels like you could still walk upright. But each moment you feel your legs are just a bit shorter and your torso just a bit longer; if this keeps up you'll be stuck on all fours soon.
From the angles you can get in without struggling too much there's no sign of your clo- wait... There, on a rock in the corner, is the tattered remains of your jeans. The undamaged wallet hanging out of the useless pocket looks like yours, at least. Probably the rest of your clothes are similarly shredded nearby. And just beyond that there seems to be a crack in the wall too perfectly straight to be anything but man-made; hopefully it's the side of a door.
The lion rubs stronger against you, waking up with a deep, soothing growl that must be a lion's purr.