Little Butterfly Series by Hinako Takanaga

The cute, outgoing Yuki Kojima and the mature misfit Atsushi Nakahara, are two boys as different as can be - and yet, somehow they are attracted to each other. Kojima seeks to befriend the class outcast and soon learns of Nakahara's troubled family life - the uncaring, abusive father and mentally unstable mother. As Kojima yearns to somehow comfort Nakahara, he gradually becomes aware that his feelings for the other boy arise from more than mere sympathy... moreThe cute, outgoing Yuki Kojima and the mature misfit Atsushi Nakahara, are two boys as different as can be - and yet, somehow they are attracted to each other. Kojima seeks to befriend the class outcast and soon learns of Nakahara's troubled family life - the uncaring, abusive father and mentally unstable mother. As Kojima yearns to somehow comfort Nakahara, he gradually becomes aware that his feelings for the other boy arise from more than mere sympathy. When Nakahara declares his own romantic feelings for Kojima, their relationship becomes one of sexual exploration as they face their first steps into adulthood together. less

Having decided to apply for the same school as Nakahara, Kojima must study feverishly to pass the entrance exams! Nakahara helps Kojima with his studies, but is frustrated by his strong sexual feelings that have yet to be reciprocated. Things hit rock bottom when Nakahara gets a surprise visit from his Uncle Sugisaki... moreHaving decided to apply for the same school as Nakahara, Kojima must study feverishly to pass the entrance exams! Nakahara helps Kojima with his studies, but is frustrated by his strong sexual feelings that have yet to be reciprocated. Things hit rock bottom when Nakahara gets a surprise visit from his Uncle Sugisaki. Trouble brews when Nakahara's father asks Sugisaki to assume responsibility for his son and mentally ill wife, who he's planning to divorce, in exchange for a sizeable loan that Sugisaki needs to save his founding business. less

Kojima can't take spending so much time away from Nakahara and decides to visit his home. Upon their reunion, Nakahara finally makes his decision... and the two spend an unforgettable night together. Where is this budding, youthful love headed?