You, and your girlfriend had a below ground pool built into your backyard with the assistance of people from the city who had a bulldozer, cement, marble tiles, and pipes that could connect to the sewers underground in case you decide to drain it. Now all you needed was something to swim in the pool with.
Luckily, your girlfriend searched online, and found an online store for people to buy custom mermaid, and merman tails as she decided to order the normal fish tails for a cheaper price. You weren't exactly good at swimming like a merperson, mostly because of how confusing the species could develop. You were confused at what color tails he bought, because right now the site had multiple tails with different colored tails, which meant that the tails could tell what kind of merperson would become.