Ty decided he should join her. He did feel a bit distressed that only now had his... well... her mother revealed this to her, but he understood that it was to protect her.
"What happens when I break the seal?" Larissa looked away and pursed her lips a bit.
"Essentially, you'll be reborn. You'll enter me and become a foetus for six months, then you will be laid and hatched as your true self, albeit also fifteen, and you'll keep all your old memories."
Ty admitted that that seemed appealing. He decided to make his wish.
"I wish –"
"– WAIT!" His girlfriend had overheard and ran over.
"I want to join you!"
Larissa seemed amused, but spoke to her gently.
"Of course. I assume you have heard what has been said, and you must undergo the process too. However, you would effectively become twins as a result. Don't worry, your relationship may continue, as us mermaids are very open. Are you sure you wish to go through with this?"
"Of course!"
"Ah, yes! Before I forget, you will inherit the same powers as Pella here," she said, gesturing to Ty. "But, what is your name?"
"Does my current name matter? I want a new one, too!"
"All right then. You shall be called Edessa from now on. Now, I will break the seal and the two of you will be absorbed. Are you ready?"
"Yes" said both soon-to-be mermaids.
Larissa began to chant...