Just as you're about to reach the surface, you suddenly stop and start thinking about why you need to get out of here.
"What's wrong? You can't escape from here, can you?" The mermaid who kissed you giggled at this.
"I... I... "You're trying to remember why you're trying to leave here.
"My memory... It feels..." You start to feel like you've lost your reason to run away from here. You start to feel that your home is at the bottom of this sea with your sorority sisters.
"How about it, are you ready to join, sister?" She whispers in your ear in a seductive tone. Soon, your last defense as a human disappears and you begin to see these mermaids as your sisters.
"Yes, sister," you say with a smile.
The mermaid starts kissing you and you start kissing her back. Your kiss is full of sisterly passion, as your sister begins to grab your thighs and starts channeling her magic towards you. You begin to feel that your leg bones begin to melt as your legs begin to fuse and your nervous system and muscles become one. You start to feel that the spine starts to extend all the way to the end of your legs. Finally now your legs have begun to fuse and begin to lengthen as blue scales begin to appear all over your legs. You are now fully a real mermaid and a new sister to your sorority.
"Welcome new sister," the mermaid said breaking your kiss.