Location: a steaming outdoor hot spring at night, where the pale moonlight reflects off the rippling water and the thick white mist rising from the surface, partially obscuring the dark stone edges of the pool
Position: Yui is waist-deep in the thermal water, leaning toward the viewer with her wet hair clinging to her shoulders and her hands reaching out to unfasten clothing; her face shows a shy seductive expression with a sideways glance, lowered chin, and softly parted lips; a medium shot
Clothing: Yui is fully naked