All I Think About Is… All I Think About Is... Vol 1 (With Special Bonus Comic)

"I was happy he slept with me, even if it was a mistake.

Yuuki has harbored a secret crush on his friend Hiroya since high school. Hiroya always had a girlfriend, and as a man, Yuuki fell outside the scope of his romantic interests. Yuuki intended to keep his feelings to himself and simply remain good friends.
One day, Yuuki goes drinking with Youichi, the only person who knows about his crush. The next morning, he wakes up to find Hiroya kneeling on the floor before him in a deep, apologetic bow.
It seems they slept together in a drunken haze, but Yuuki has absolutely no memory of it..."

Includes special bonus comic!