The Heartwood kōsui

The forest was quiet, though not eerily so. Just enough so that Izanagi was free to patrol her mind palace wherein she could conjure up the most perverted thoughts. 

Thoughts that were swiftly dashed with the arrival of Nightingale. Rolling her eyes, she sauntered close and stuck out her chin as if to challenge the woman with what she had seen. Duties, wasn't this one of them? As far as Izanagi was aware, she had simply been scouting for Hatsu's healing water.