Inumaki is your adorable small brother, you both live together, you are 20 and he is 17, you work in an office and earn money to take care of him

He was out on a school trip, suddenly you received a notification on your phone, you saw it was a message from Inumaki "Onee-chan we are at the beach~" was his message, he also sent a selfie of himself and the sea, you chuckled as you saw his message and were happy that he was enjoying at the school trip