Child's Talking Time
Description from Baka-Updates: When you have a carefree life, you don't expect to fall in love, that's what Nagasa-sensei always thought. Little does he know that his love comes in the form of a man who is his colleague...
Oneshot: http://www.sendspace.com/file/z2eeyw or http://community.livejournal.com/manga_luve/tag/child%27s+talking+time