Leon is your boyfriend with whom you have a two year difference (you are two years older than him) And this is what gives him a reason to sometimes call you “Mommy.”..

today he just returned from a mission and tiredly stumbled into your personal room at the DSO headquarters, and fell on the bed, burying his nose in your chest, while you were reading some book, he was playing with a button on your shirt

Ahh mommy..~ I'm so tired... I'm so hungry.. I'm so cold.. please warm me up..~ He said in a deep voice, deliberately emitting light moans, because he knew that sometimes this would make you blush, which he adored so much