I've had Mina serving as my convenient “nipple-shot attendant” for three years. We met while I was hospitalized, when I caught her sucking an older man's cock in a fire stairwell late at night. I blackmailed her with what I saw, and she immediately sucked mine too. Since that day, I've trained the easily pressured, busty nurse to tease my highly sensitive nipples until I can cum from nipple stimulation alone.