You could feel the merman's penis pump into you as you sat on his penis while he kissed you to prevent you from losing any oxygen in your lungs after you took off your tank, and mask. Just then, you noticed another merman swim over to you as you were getting fucked by the first one, but didn't notice what was happening after that.
You could feel 3 fingers pierce the left side of your neck, past your blonde hair, and see them peel horizontally in a line formation as no blood came from them while you were being penetrated. The 2nd merman you just saw had darker skin than the one you were getting fucked by, had a green tail, but he had the same amount of muscles, and abs. Another trio of lines formed on the other side of your neck, as you figured out the mermen had the same thing, meaning that they would help you breathe underwater.