Kindness emanates from the natural benevolence of our true inner nature. Kindness is interested in the wellbeing of others and of other sentient life. And kindness occurs when it is allowed to act freely, without the intrusion of a credit-seeking ego.
There is a unique pleasure in kindness, yet it is unlike the pleasure we find in the fulfilling of a desire. Rather the pleasure of kindness is more transcendentally selfless, rather than self-centred.