Examples of spontaneous devotional service can be easily seen in Kṛṣṇa's direct associates in Vṛndāvana. The spontaneous dealings of the residents of Vṛndāvana in relationship with Kṛṣṇa are called rāgānugā. These beings don't have to learn anything about devotional service; they are already perfect in all regulative principles and have achieved the spontaneous loving service of the Supreme Personality of Godhead. For example, the cowherd boys who are playing with Kṛṣṇa do not have to learn by austerities or penances or yogic practice how to play with Him. They have passed all tests of regulative principles in their previous lives, and as a result they are now elevated to the position of direct association with Kṛṣṇa as His dear friends. Their spontaneous attitude is called rāgānugā-bhakti.
Śrī Rūpa Gosvāmī has defined rāgānugā-bhakti as spontaneous attraction for something while completely absorbed in thoughts in it, with an intense desire of love. Devotional service executed with such feelings of spontaneous love is called rāgānugā-bhakti. Devotional service under the heading of rāgānugā can be further divided into two categories: one category is called "sensual attraction," and the other is called "relationship."
In this connection, there is a statement by Nārada Muni to Yudhiṣṭhira in the Seventh Canto, First Chapter, verse 30, of Śrīmad-Bhāgavatam. There Nārada says, "My dear King, there are many devotees who first become attracted to the Personality of Godhead for purposes of sense gratification, from being envious of Him, out of fear of Him or from desiring to associate affectionately with Him. Ultimately these attractions become freed from all material contamination, and gradually the worshiper develops spiritual love and achieves that ultimate goal of life desired by the pure devotee."