The fourth question is just the "will you date me question," so you'll want to reach the indicated spot on the compatibility gauge at the top to actually get there. IIRC red lure fish have the highest target value so it might be easier to use a different lure. I've also posted a rough walkthrough if you want to save some time.
My greatest fear is to be told that I've revived the car batteries in the ocean meme. When I went to the beach about a year ago people genuinely had "don't throw car batteries in the ocean" signs in front of their houses. I couldn't tell if it was because they didn't know it was just a joke or if people actually threw car batteries in the ocean...