Summary: atmendriya-priti-vanchatare bali `kama' krsnendriya-priti-iccha dhare `prema' nama
"The desire to gratify one's own senses is kama [lust], but the desire to please the senses of Lord Krishna is prema [love]." (Caitanya Caritamrta Adi 4.165)
Here priti is the common factor to the two definitions: lust and love. In the verse Prabhupada translates priti as "to please", yet throughout his books priti is related to the principle of love, and technically equated