Since it was surprisingly easy for Ariel to accept the fact that her daughter is a lesbian, Lisa, Kendra, and Molly figure it's time for them to tell the truth.
A few days after their high school graduation, the girls ask Ariel if the want to go for a swim at Molly's beach house. The four of them are in their bikinis, walking along the beach.
"Mom," Lisa finally says. "This is the reason why the three of us are friends...."
The three girls take of their clothes. "What's going on?" Ariel's voice starts to shake.
Kendra, Lisa, and Molly sit down. Holding hands, they transform into mermaids in front of Ariel. Ariel's eyes went wide and her jaw dropped.
The three mermaids explain calmly their story, as well as apologizing for keeping it a secret.
"This doesn't change anything, Mommy," Lisa starts crying. "I still love you. We all love you."