Little Pumpkin (Osomatsu-san x Little sister!Reader)

Aren't you the most cutest little button ever ? With your rosy cheeks, your soft (h/c) hair and your sweet (e/c) eyes, no one could resist you. You were a 11 month orphan baby girl, waiting to be adopted by a happy and loving family. One day, Mr and Mrs. Matsuno decided to adopt you ! And so began the story of your life as the precious little pumpkin of the matsuno residence ~

Warning : Fluff, Fluff everywhere.

So i wanted to do an Osomatsu-san x Yandere!reader but it ended up as an Osomatsu-san x Littlesister!reader instead. Yeah, i know. Also, this is my first fanfiction ever and english is not my first language so i hope i'm not going to make your eyes bleed ;;w;;