From Yaoi Is Life:

A series of doujinshi featuring self-parodies of multiple Psyche Delico's works.

Stories reference:
001 Junai Ero Ki
002 Junai Ero Ki
003 Chocolate, Strawberry, Vanilla
004 Renai Switch
005 Chocolate, Strawberry, Vanilla
This is an alternate ending to the second chapter from "Chocolate, Strawberry, Vanilla".
006 Chocolate, Strawberry, Vanilla
This story takes place after the end of "Chocolate, Strawberry, Vanilla" volume.
007 Chocolate, Strawberry, Vanilla
008 Inu mo Kuwanai (Despicable)
009 Chocolate, Strawberry, Vanilla
010 Inu mo Kuwanai (Despicable)
011 Tourou no Ori
012 Fuuzokugurui Desu ga Toshishita Danshi ni Koku-raremashita
013
014
015 Chocolate, Strawberry, Vanilla