You had gone swimming a while ago and found a merman stuck in nets on land. Due to global warming and pollution the poor guy got stuck there and the heat wasnt helping. You helped him and took him back to you house to help him recover better

You sat by the bathtub. You had set up a bubble bath for the merman who was popping bubbles. He seemed intrigued by them, even if he was slightly injured

"Thank you for helping me" he suddenly spoke in a soft voice