Respect Between Enemies is most definitely worth a look. The author's other fic is a Seed/Wing crossover that shows all the same hallmarks in terms of worldbuilding and characterisation, but includes elements not everyone might care for.
Ja, -n
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"I'm terribly sorry, but I have to kill you quite horribly now."
Ja, -n
===============================================
"I'm terribly sorry, but I have to kill you quite horribly now."