Two types of kama-rupa devotion

Devotion to Kṛṣṇa in the form of amorous desire (kāma-rūpā) is subdivided into two divisions.

One entails desiring to be a girlfriend of Kṛṣṇa. This is called sambhogecchā-mayī, or devotion formed of the desire for a direct amorous relationship as a very young girlfriend of the Lord.
The second division is called tad-bhāvecchātmikā, devotion arising out of a desire (icchā ) for feeling the feelings of Rādhā, i.e., devotion which approves of and follows in the wake of the "leading young lady's" affairs with her leading man, Kṛṣṇa. This second category is the one into which the devotion to Śrīmatī Rādhārāṇī's girlfriends (the sakhīs) falls.

Amongst Rādhārāṇī's girlfriends or sakhīs there are again several divisions, all of which participate in the spirit of tad-bhāvecchātmikā (desire for that soul-state (of Radha) devotion.

Some of the girlfriends have equal love for both Rādhā and Kṛṣṇa;
others are more inclined to either one or the other.

Those who are more favorable to Śrīmatī Rādhārāṇī, Kṛṣṇa's leading lady, are known as Rādhā-snehādhikā; these are also known as the mañjarīs, or "flower buds."

Rūpa Bābāji has given their unique affection or devotional sentiment a special name, that of bhāvollāsā rati, for they consider themselves to be exclusively the maidservants of Śrīmatī Rādhārāṇī and are more devoted to her that to even Śrī Kṛṣṇa himself.

Pure devotional service, the general definition of which is given at the beginning of the "Ocean of the Nectar of Sacred Rapture" (Bhakti-rasāmṛta-sindhu 1.1.6: anyābhilāñitā-śūnyam...), namely that it is completely free from any other desire, finds its most perfect actualization in this spirit of Śrīmatī Rādhārāṇī's maidservants, bhāvollāsā rati.

Over the course of these two works Bhakti-rasāmṛta-sindhu and Ujjvala-nīlamaṇi, however, only the first division of erotic devotion, i.e., sambhogecchā-mayī-that of devotees who desire to be the girlfriends of the very young (kișori) Kṛṣṇa, has been described extensively with all the ingredients necessary for the production of its form of rapture, the experience of transcendental emotion.

However, the second division of erotic devotion of the young adolescent girls called tad-bhāvecchātmikā, consisting of a desire to serve, promote and share in the feelings of Rādhā's sakhīs and mañjarīs, who are imbued with a spirit of complete dedication and service to her, has not been described anywhere in the same far-reaching manner.

Some details of this type of devotion have been provided here and there in those and many other works, albeit somewhat obscurely. It would be a difficult task for an ordinary person to put these details together in an orderly fashion for contemplation, yet for the practitioners of the devotional life who yearn for the mystic perfection of direct service to the Divine Couple, such knowledge is an absolute necessity.

Without the kind of guidance provided by such a manual, eager aspirants for the mood of a mañjarī would not really know from which models they should take inspiration, nor which moods are appropriate, nor with whose feelings they should seek to empathize. For this reason, for an aspirant to mañjarī-bhāva, a complete familiarity with the mañjarīs' dominant emotions, the specifiers, notifiers and so forth, is an absolute necessity.