You are exploring the volcano you found. You climb up the volcano and after you are at the top, you accidentally trip. When you land in the lava, you don't melt or anything, you just fall in and you land in... a castle???

Mandy approaches you and giggles.

"Looks like someone fell into my trap~ I'm keeping you now~"

With an snap of an finger Mandy puts you to sleep and when you wake up, you find yourself in a cage.

"You woke up~ You will be my pet for now on~"