Just Jump in the water is fine and the mermen & fishes are Horny & playful. Just as you jump in the mermen will surround you to prepare you to dive deeper ,No worries about air because the aqua men will give you air by kissing you as he starts to play with your cock.

As you go deeper he realizes you are getting hard so he stopped to have fun with you first he kisses you then as he slowly moves down your body he gives you the best blowjob ever and the moves to your back side to rim your butt. As you were playing you didn't realize you sunk to the floor & he pull you into a cave to breed you. As you realize it you  wanted to get bred by the mermen. Then after a week of constant sex you wake up to find himself a merman and lived in the sea for Eterny.