I've only been reading tons and tons of Romance manga >_>
My favorite ones are Taiyou no Ie, the one as my avatar.
Summary:
Motomiya Mao is a High School student who has "lost a home" after her father gets married again. She starts to live with Nakamura Hiro, 23, who knows Mao since childhood. Since that time Mao spent all her free time with Hiro´s family, and after his parents deaths, Hiro's waiting for the day when his brothers and Mao would once more live together.