If you have access to his book Greek Homosexuality by Kenneth J. Dover, the info on the following pages might give you more food for thought on the exact nature of the relationship that exists between Achilles and Patroklos. This book is still one of the best ones on the subject. Be advised these page numbers are for the 1978 Vintage Books edition. If you want to obtain a used copy it is available from Amazon at the following link:
http://www.amazon.com/gp/offer-listi...condition=used
See these pages: 41, 53, 70, 130, 197, 199