Wait does the sister HAVE A THING FOR HER BROTHER WTF
Guyssss...read this ... http://www.mangago.zone/read-manga/goshujinsama_wa_ouji_ga_o_suki/
...I now know the difference between a supportive sis and creepy sis
it doesnt have to be to extreme levels like outright saying she wants to fuck him but theres literally a page where she inserts herself in her brother and their boyfriends sexual relationship. obviously that tells you something shes not supportive shes gross who even watches their sibling have sex and goes 'omg so cute'????
WTF IS THAT GURL MY EYES NEED TO BE CLEANED NOW