My 2000 GZ250 Bobber Project

[Water Warrior 2]

Wow, that is one fascinating color change. You must have cooked the oil pretty good with the high temps. Here is what "I" would do just to be safe. Get a new oil filter and some more oil for an oil change. Run the bike just a minute or so to slightly warm it up and drain the oil and change the filter. You don't want even a small portion of cooked oil in the engine. Make sure the oil is motorcycle specific or anything else that is certified for motorcycle use. Good old Shell Rotella 15-40 will work well and is cheaper than most. Our last 2 bikes were happy with it as a steady diet. Shell finally got around to a moto certification after they realized how many riders were already using it.
Hopefully the engine was not damaged. You now know why you never leave an unattended bike running. Also just be very thankful a child did not get attracted to an unattended bike and get seriously burned.