I only read BG and share some shamelessly sappy romances. Lots of older-man/younger-woman and brother-sister pairings. I just love watching two people fall in love and dance around each other. It makes my heart feel so good.
I have read several books of Futagawa, and I feel like he is a genius in love and knows how to write romance plots! The sister in this book is indeed an immature baby, but she is also a baby who was spoiled by her brother, haha. [Yellow heart]