As soon as your hand touches the frog for a second time, it starts to tingle, the creature letting out a croak before seemingly melting. You panic, trying to shake it off but it merely climbs up your arm, your fingers melting into some sort of paws. You try to tug it away despite knowing it's too late, but the goop merely spreads, dripping down your legs and nearly snapping them, even if somehow it wasn't painful.
The goo melds with your skin, forcing your mouth into some sort of short muzzle. Your tongue feels like goo, dripping down into something longer as your shouts turn to croaks. You pant for air as your struggles lessen, finding yourself crouching down as another ribbit escapes.
You're some sort of frog yourself now, albeit bigger and more humanoid, but you can't protest. It doesn't feel bad, and it's actually quite nice feeling now that it's finished. Yes, you could definitely get used to a body like this.