http://www.dlsite.com/maniax/work/=/product_id/RJ158955.html

Not much to say here except it's your typical "screw your childhood friend" sort of story, albeit here the childhood friend seems to be just as much of a pervert as the protagonist, if not moreso.

001: Title Slide
002-084: Story, Large
085-167: Textless, Large
168-250: Story, Small
251-3??: Textless, Small