Here it is!
Link to Ouran Chp 81 (07/27/2010 — updated to include chp 82 previews and minor edits from Kuma-chan. Edits do not impact the story.)
Link to Ouran Chp 81 in PDF Reader Format — RETIRED
I will be retiring Ouran one month after the release of the last chapter.
Here are some notes that will help you with some of the references within the chapter.
Aphrodite and Adonis
Apollo and Hyacinthus
Castor and Pollus – Gemini, the Twin Stars
Uranus and Kronos – (rather brutal of Kyouya wanting to castrate his own father)