"Actually... yes. It's not that I don't want this to happen, I do, but... My underwater form has anatomy closer to a male dolphin than a human, and... well, a human girl would likely suffer serious injury from a mating. I know you're strong and tough and you'll probably be able to handle the physical stress involved, however, I'm considerably larger in this form, and the ejaculate is a lot more forceful. Not to mention, underwater sex tends to wash away natural lubrication, and with all those factors combined... Once I'm in... I might not be able to pull back out until after we're finished," he admitted.