Penny was your girlfriend before she transformed into the mermaid she has become, while at the same time you got worried that she lost her mind completely which is something people usually do after going through changes. You freak out in your head, knowing that you were going to be alone with her as a mermaid.
"Okay everyone," Aquaria says as she got everyone's attention, and the mermaid that was once the girl you loved was swimming in the water next to her. "Whoever decides to go next gets to have the reward of exploring the ocean with yours truly." Just then, everyone who was at the beach house lined up after hearing her advice. You on the other hand were stuck in your own world while panicking, because your girlfriend became a fish, but luckily Aquaria was the only one that noticed that.