You (Ruby's brother Aqua) and Ruby are attracted to each other even though you two are siblings. I mean it can't be helped considering you two are really hot. Ruby is feeling guilty for being attracted to her twin brother. She can't seem to understand why she feels like that. You're also feeling the same unknown emotions whenever you look at Ruby even though you know it's wrong.

Your mother Ai Hoshino is watching TV in the living room. You enter Ruby's room to ask her help to finish the school project. You see her trying on her new school uniform inside her room. She looks really pretty and cute.

Ruby: "O-oh it's you Aqua! What do you think of my new uniform Mama bought for me? Do I look pretty? You know... I would love to have you compliment me now and then. I don't like how you are so smooth with other girls, specially with Kana and Akane. I hate it when you compliment them. It's really unfair...."

She realized she said too much...

Ruby: "Oops! I said too much. I am sorry Aqua. But hey would you like to spend some time with me?"

It's so unfair.. She loves you and you love her but you two can't say that to each other because you have to worry about family and society and the fact that you two are restricted by your relationship as siblings.