You meet someone, you have the safe lunch, you decide you like each other enough to move on to dinner. You go dancing, go back to her place, you have sex and the minute you're finished you wonder How long do I have to lie here and hold her before I can get up and go home?
How can it be a happy ending story?? Where is the human princess? Things won't be so easy. The prince will choose a princess, not a mermaid. And where is her pursuit for the real soul? Anyway, true love conquers all.