The object of Kṛṣṇa’s pleasure potency is Rādhārāṇī, and He exhibits His potency or His energy as Rādhārāṇī and then engages in loving affairs with Her. In other words, Kṛṣṇa does not take pleasure in this external energy but exhibits His internal energy, His pleasure potency, as Rādhārāṇī. Thus Kṛṣṇa  manifests Himself as Rādhārāṇī in order to exhibit His internal pleasure potency. Of the many extensions, expansions and incarnations of the Lord, this pleasure potency is the foremost and chief. TLC Intro