Genre: dirty, dirty smut
Warnings/Enticements: Spoilers for The Last Olympian, (Highlight to view):</b> *Achilles spot porn, anal, rimming *
Notes: There aren't enough fics on this topic, so I wrote one. Completely disregards Heroes of Olympus. Crossposted everywhere, sorry for the spam.
Summary: Annabeth recognizes a once-in-a-lifetime opportunity when she sees one, and decides to conduct an experiment.