Kyuushiki (OGAWA Chise)

How wonderful dormitory life is! Two students killing time while they're waiting for their laundry to finish.

Shun and his older brother have a little strange relationship... There is also Koganei from Kusatta Rasen, and the Makino brothers appear in Ayaui Kyouen; both short stories are collected in Rakuda Tsukai to Ouji no Yoru.