>>3880431It isn't one line, she complains about her plugsuit being tight in the chest, she's happy when her new plugsuit fits her chest perfectly, and [spoiler:lit] she describes herself as a nice girl with big breasts while pressing them directly against Shinji's back. That's echoed in the ending when Shinji repeats her description of herself that, oh also, was part of her formal introduction to him.[/spoiler:lit]
It's actually an important part of her character. Not to mention the Japanese connection with breasts to motherhood. Sakura Nagashi didn't include footage of breastfeeding for no reason.