These two can create a fun, playful and outgoing relationship that both will feel comfortable in. They may argue if Leo takes Gemini's flirtatious nature too seriously, or Gemini thinks Leo wants to 100% control their relationship. With all the energy that these two posses I'd advise that they go out and do things, like go to the park, get out some of that energy together. These two are skilled at communication and should sustain a pretty healthy communicative relationship. They can have a great union full of fun, they are optimistic so they will always be looking for the best in their situations.