About Lettuce , Pie and Ryou... An idea...
So... Is there any fanfic Lettuce X Ryou // Lettuce X Pie but:
With Ryou being jealous about Lettuce spending time with Pie.
Ryou is like "I don't have time for a relationship but... I don't trust that aliens and seeing Lettuce with Pie, makes me feel kinda angry"
By the other hand, even though the war between aliens and humans is over, Pie can't understand why Kish and Tart are like "Ichigo Ichigo Ichigo " or "Pudin, Pudin, Pudin", also he can't stop thinking about that TMM who fight against him and made him doubt about his abilities. He don't even know what to do with the fact that now, his race is living on earth and are living normal lives. How is to live like a human, with a calm and normal life? He don't trust anyone, and he doesn't want to ask Kish or Tart, so he started to talk with Lettuce.
All the time when her shift finished, she meets with Pie and go outside, walking around Tokyo and show him that life as a human are not that bad.