Wit's manga / #Brother complex(2)

Guy is bad with women because he has a severe brother complex, but when his gay friend starts texting his brother he offers up his own body to keep his brother pure

Louis and Nick have been dating for seven years, but that all ends when Nick breaks up with Louis to marry a woman. Understandably upset, Louis gets on well enough, until Nick's younger brother Theo turns up as a student is his college course. And boy does Theo have a strong brother complex, to the point that he wants to get to know Louis because he used to date his brother. Starts off a little dark but ends very happily