Growing Up Together (слэш)

AU Modern: Wei Ying was six years old when he walked over with a plate of cookies to greet the new next-door neighbors and the one to open the door was a boy slightly older than him with a cold and quiet looking face. Various events occuring as they slowly grow older together.
“A-Ying not allowed to date until the age of fifteen years old.”
“A-Ying not allowed to be courted until he is fifteen years old.”
“A-Ying you are not allowed to penetrate or be penetrated until you are eighteen years old.”