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Pairing: Kakashi x Iruka (or is it Iruka x Kakashi?).
Iruka visits a hospitalized Kakashi. Their time together is short, and Kakashi is in a physically weakened condition, so Iruka has to be... creative.
Note 1: Despite the "2" in the title, this is not a sequel, so don't worry that you're missing something. There was a "Sumata Tokuhon" before this, but it was a novel, and apparently only linked by having the same... theme (sumata).
Note 2: The main story in this book was titled "Wagamama" when it appeared in the anthology Ninpouchou Gaiden KakaIru no Maki Mitsuiro Shungahou #1.