this is one of the hottest fuckin shrinking man stories ive read in years.  i like to imagine the stepmother has a huge bubble donk, with giant cheeks and a deep asscrack even for a regular sized man, but the stepson is so tiny!  so hot how she takes pleasure in farting on him and burying him in her giant shit-filled ass, how she even rubs him off while he’s encased in her shit!  id love to see scenes where she sticks his tiny naked body to a surface and shakes her ass over him and demands he fuck her giant asshole while she farts on him, and she sits and grinds and farts on his tiny body and dick until he comes involuntarily.  maybe she involves her other mature, big-booty girlfriends to help her sexually abuse his tiny body with giant ass, farts and shit, and it gives them sexual pleasure to do this to him.

anyway, great story, and please continue!