the short answer to your question is no. these kind of casual "exposures" are not really exposures at all and i would not worry if i were you. just for a point of reference exchanging bodily fluids through giving oral sex to a person with hiv is almost no risk for transmitting hiv so this really won't put you at risk at all. .
i was kissed on the cheek by a hiv positive person soon after receiving superficial scratches. is there a risk?