Homie speaking mad facts about sisters, not sure why manga has such a characterization. Romance manga almost always has a brocon or siscon type of character
Wait, his surname is a pun with big?
(I did know someone who surname is bighi, but they are actually a tall family. My friend had more than 1,80 and if I am not wrong his parents both was also bigger than 1,80 and one of then had around 2 meters)