Let me kiss on a fountain
Mission accomplished, you increasing your heart rate

from Rick Ross (Ft. Drake & Wale) – Diced Pineapples Lyrics on Rap Genius

Kissing on her fountain refers to kissing her vagina as she is climaxing and squirting. Thus, Wale has her in the spot in terms of sexual desire so she’s passionately breathing faster and her heart beats uncontrollably at that point — he has accomplished his mission.

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