Sundarakānda - Canto 10

Hanumān catches sight of Rāvana reposing on an excellent couch decked with various ornaments, himself adorned with jewels of every description. Perceiving Mandodarī graced with bright jewels and lying asleep on a wonderful couch not far from her husband in the midst of dancing girls lying in a disorderly state with diverse musical instruments clasped to their bosom, and taking her to be Sītā, Hanumān gets enraptured and exhibits his joy through various simian gestures such as kissing the end of his tail.