Danbooru-based image board with a specialization in high-quality images.
ayanami_rei nagko naked neon_genesis_evangelion nipples yuuji

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A work of art at its best.
I don't see how this is Rei. Seems like a generic white-haired girl to me (Rei has blue hair).
Even though it's full nude, still looks quite nice.

Artistic Nude.

ps: If you look at the other drawings by this artist, you can see this person does a lot of gainax's characters. This no doubt almost has to be Rei.