This is a true incest!!
Is it wrong? Maybe? Yes?
Is it cute? Freaking adorable
Good points: The brother and sister have a great relationship, like they get along really well./ The story is really cute/ It's not ecchi, so it feels "less wrong"?/ Funny / The couple genuine love each other/ Happy end
Bad points: Fast pacing / Bro and Sis just go with the flow while falling in love / Short conflic, like somehow their friends, mom and dad, just accept them later on too easily.
Siscon Ani To Brocon Imouto Ga Shoujiki Ni Nattara