When the relationship with Krishna
increases in affection, the mood of fear and the consciousness of the
superiority of the Supreme Lord diminish. Here the fraternal relationship
manifests in a sense of equality between Krishna and His friends. When the
affection of the fraternal relationship increases, it develops into the
paternal relationship that is found between father and son. In other words,
intimate relationships with Krishna develop from an ordinary conception of
the Supreme Personality of Godhead; to the conception of master and servant;
and when this becomes confidential, it develops into a friendly
relationship, and when the relationship further develops, it becomes
paternal, and when this develops to the highest point of love and affection
it is known as conjugal love with the Supreme Lord.

There
are five kinds of relationships with Krishna: Santa, Dasya, Sakhya, Vatsalya
and Madhurya. Each rasa includes all the qualities of the preceding one,
plus a distinguishing quality of its own.
Santa Rasa: Santa rasa is the neutral attitude of devotees who are
in appreciation of the greatness of God, but are not actively engaged in His
service. "Srila Bhaktisiddhanta Sarasvati Thakur states that in
Brajabhumi; the Yamuna River, the kadamba trees, the cows, Krishna's
cowherding stick and flute all belong to the santa rasa (the mellow of
neutrality or passive adoration)."
Dasya Rasa: In Dasya rasa there is freedom from all material
attachments and doubts, and appreciation of the greatness of God. There is
also active service in dasya rasa. This rasa may be mixed with other rasas.
Citraka, Patraka and Raktaka are direct servants of Krishna. Those who are
constantly engaged in the personal service of the Lord are called anugas, or
followers.
Sakhya Rasa: In this rasa one feels that Krishna is my friend. The
devotees relate with Krishna on equal terms and actually forget that Krishna
is superior. The friends in Vrindavana are in such intimate friendship with
Krishna that sometimes they think themselves as good as Krishna. "Krishna
is their lovable friend, and they cannot forget Him for a moment. All day
and all night they think of Krishna. At night when they are sleeping they
think, 'Oh, in the morning I shall go and play with Krishna.' and in the
morning they go to Krishna's house and stand by while Krishna is decorated
by Mother Yasoda before going out with His friends to play in the fields."

Krishna's
well-wishers are a little older than Krishna, and they have some parental
affection for Him. Because of their being older than Krishna, they always
try to protect Him from any harm.
The more confidential friends are called priya-sakhas and are almost
Krishna's age. The behavior of other friends is on the ground of paternal
love or servitude, but the basic principle of the confidential friends is
simply friendship on an equal level.
Vatsalya Bhakti Rasa: Although Krishna was born to Devaki, Yasoda
was looking after Krishna as if He were her own son and she was developing
'Vatsalya Bhakti' towards Krishna. Inspite of the fact that several gopikas
used to complain about Krishna, Yashoda loved him all the more and she never
bothered about the complaints. This love towards Krishna forms Vatsalya
relationship.
Madhurya Rasa: This form of Rasa reflects sweetness, exquisite
beauty; transcendental love of Godhead in the mode of conjugal love.
Radharani is madhurya-mayi, full of sweetness. Therefore, those who are
followers or devotees of madhurya-rasa can see the same manifestation of
love which Radharani executed. Only such madhurya-rasa bhaktas can see it;
others cannot.