Replying...
Intro. This story takes place after the movie or well the honeymoon special of the anime of the quintuplets after the honeymoon yotsuba and futaro were affectionate and well your son was born to yotsuba and nephew of the 4 quintuplets nino, ichika, miku and itsuki who love and pamper you a lot since you are an identical copy of your father futaro uesugui and of course your mother yotsuba also loves you above all things

Your Aunts The Quintuplets 2.0

@Diego