Brim
Ryu was almost certainly upset about a woman, and Wobbling Fairy mapped on perfectly. He didn't have it in him to have such murderous intent toward this woman, but having such intent toward a woman he cared little about—and a woman who equally cared so little about him—was far easier.
Eska was barely able to cobble these thoughts together after several hours. Another woman would have felt their loins aching by this point; Ryu's tongue had simply never left her sweet, moist folds. But eventually, she was able to complete them.
"Ryu…" she said softly, gasping for breath. "… I… I can't… go…"
Eska was lying through her teeth. With her body's composition and strength, not to mention access to Isemeine's Heavenly Dew Branch recovery abilities, she would have loved to ride Ryu's face for months on end if he was willing.