Trying to find this accidental confession yaoi manga

So, a while ago, i was reading this really nice BL/yaoi manga. But now, since I didn't add it to my lists or bookmarks, I can't find it. This is what I can remember from the beginning: this short guy wants to confess to a girl, but instead of getting that girls number, he got her brothers number. So he told him to come to the roof, where he confessed to him. When he heard the door to the schools rooftop open, he yelled with his eyes closed "I LOVE YOU!" (I think). I can't remember what the uke looks like, but I do remember the seme and his sister sort of. The sister is the popular girl at school, someone every guy wants to confess to, she has black long hair. The seme is pretty tall, his longish black hair always covers his face until he got a haircut, and he's mostly left alone at school. I think the sister didn't want everyone to find out they were siblings.
Can someone please help me find out what this manga is named? I've looked everywhere but I can't find it. If you have it in one of your lists or your bookmarks, please do post the link or send me it