No way! A love story porn game is strictly for adults only. It has explicit and sexual content that goes beyond what is acceptable for general audiences, especially children and teenagers.
Definitely not. A game of pretend porn comic is not suitable for all. It has adult-oriented themes and imagery that may not be in line with the values and interests of a wide range of people.
The 'lemon' aspect might be a bit hard to come by in a clean way as it often involves inappropriate content. But for normal Korra and Mako fanfictions, you could also try FanFiction.net. Some stories there might show their relationship developing, their adventures together, and how they support each other, which can be really interesting to read.
Korra could meet the founders of the different bending disciplines. She could meet the first water benders and learn about the purest form of water bending. This would not only enhance her own skills but also give her a deeper connection to her water - bending heritage.