Ass on fire!

As if on cue, her ass started burning the second she realized what plant touched it.

"Oh, God. Ow, ow ggaah!" Amilia jumped, ran and scratched her ass like a maniac, before jumping back in the lake for the third time in two days.

She rubbed her ass as hard as she could, but it kept burning. She'd remember two remedies against poison ivy.

The first one, Jewelweed. Known to grow near bodies of water, this would be her best bet for release. Just cut the stem and anoint the juice on her ass. However, it grew quite near poison ivy, the cause of her burning bum.

The other one was Witch hazel, which grew in the shade. Harder to find, but away from the damned ivy.