Responses
probably this Otouto wa, Ookami
I think you are looking for this one:
http://www.mangago.zone/read-manga/true_love_sugiyama_miwako/
Yes it's this. Thanks
A shoujo manga where the girl's name is Ai. Ai's brother is in love with her. But I think they're not really siblings.
Thank you in advance (づ￣ ³￣)づ