1 - 4) Hana to Kurumi to Amai Seikatsu
From Hoshikuzuu Scans:

While studying horticulture in England, Minoru lands an internship as the assistant to Sakura Yuji, the brother of his favorite lecturer, Mika. However, despite Minoru's stellar grades in school, Sakura has only been using him for common chores and cleaning up his personal belongings. He's got a bad attitude and lives a messy life. But in terms of work, he is perfect. Will Minoru be swept up in this Sakura?

5 - 7) Kimi no Kao ga Mitai
Oonuki runs into a strange guy on the train, and later meets him again in an interview. The guy, Takeru, hits on Oonuki during the interview, but later gets hired anyway because of his skills. One morning after drinking, Oonuki wakes up to find Takeru in bed with him... and somehow the end up living together??