FreakyFilmFan4ever: The blocking in this shot is completely reversed from the shot of Gendo planting Adam in Rei in EoE. According to Kabbalah (one of the religions Eva references many times), the right side of the body is meant to attack, the left side to defend. (Hence the stance of the Evas before a fight.) Whereas Gendo's right hand penetrated Rei's left breast later on in EoE, Shinji's left hand is blocking himself from Rei's right breast.
Quiddity: A scene extremely similar to this happens in the absolutely horrific OVA Eiken(arguably the worst anime ever IMHO). Our weak willed male main character accidently topples over a quiet, mysterious girl, and finds his hands on her breasts. The big difference being that the girl's boobs in Eiken are about 50 times larger than Rei's. Whether this is a homage to Eva or not I can't say, after all this type of scene is quite a cliche. I'm quite surprised a high quality show like Eva stooped so low.
Dr. Nick: If there's nothing else to that scene, then it's certainly not a homage to anything in particular.
thewayneiac: Rei's reaction, or rather her lack of reaction is important character development. This is not just another fan service scene (as I noted above).
