Gundam 00 2 dj - Moshimo Kono Te ga Kimi ni Todokanai Toki wa

From Futarikiri:

Pairing: Setsuna x Lockon (Neil)

Starting at a point 2 years before the first series. Lockon wants to get along with Setsuna whom he shares a room with but Setsuna doesn't want anything to do with him.