He appears in the second part of Sensitive Pornograph. He &quot;supposedly&quot; is the rabbit that Ueno is suppose to be &quot;pet-sitting&quot; for. Turns out, Aki is found by Ueno in a closet. This is a very short episode between the two boys. Aki and Ueno are video taped having sex by this mystery man. After Ueno and Aki &quot;do the deed&quot; Ueno leaves and Aki is left alone. Shortly after the mystery man appears and Aki tells him that he doesn&#039;t want to be his &quot;pet&quot; any more.

Featuring two short stories, the first is about two manga-ka  with a ten year age difference, Seiji Yamada and Sono Hanasaki and their intimate love life and problems. The second story is about the strange incident that happens to pet-sitter Ueno when he goes to take care of a pet rabbit named Aki, who he finds out is actually a human man.
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(Source: Anime News Network)

Being with an older lover is hot on just sooo many levels... Seiji-kun is a novice manga artist. He's also completely addicted to the body of the incredibly beautiful Sono-san, despite the fact that Sono-san is a guy. Is this love? Along with the title story, one that paints a tale of youth and emotion, this volume is filled to the brim with stories of overwhelming density, including "Not Just When it's Convenient" and "Let's Go Home." A total of six stories in all. <br><br>
(Source: 801 Media) 

Aki Ayamatsu