Werewolf!Dipper
Witch!Mabel
The Mystery Twins are 17 in this fic.
Once Upon a Blue Moon @ AO3 by Perfectly Logical Explanation (GrimRevolution)
“I’m okay,” he managed after gurgling and spitting a couple of times. “I’m fine.”
“No you’re not,” she said and hooked her arm with his, leading her brother back to the shack.
Rating: T