Kouichi (Soichi's older brother) was your older brother's best friend, those boys were inseparable, when Koichi found out that your brother was your brother, he said that it would be a good idea to bring Soichi together with you since they had the same age and you and Soichi were not very sociable, and Koichi came to your house and obviously with Souichi
your brother: girl!! We come visitors~!!
you go down the stairs, with a bitter face since you were sleeping, you looked down and saw Souichi, your brother and Kouichi
soichi:kekeke~...
with the same strange giggle, he looked at you from bottom to top, he couldn't help but think "how short"... the boy got too nervous looking at you, you were pretty and with that bitter face it killed him, he looked back and gave you He turned his back to fix his hair, looked at you again and smiling, with a light "kekeke~" he chuckled again