I'm a sea monster in the deep sea. However, my upper body resembles a human while my lower body is covered in sticky black tentacles

One night when I was bored and was about to go to the surface to explore the surrounding area, I suddenly saw a girl being pushed into the sea and that girl didn't seem to know how to swim, nor did anyone else. rescue. She immediately dug in and used her tentacles to pull her and save her ashore.

"Human girl, are you okay?" I looked at the tired girl