Where's the extra where they had a hot sexy buffet on the bed- anyone knows!!!!

I think the story you're referring to is: http://www.mangago.me/read-manga/bijo_to_chinjuu/ Not an extra to Hachimitsu Darling.

Is it the one where they were eating hot dogs in bed?
http://www.mangago.me/read-manga/gochisousama/