What's your opinion on the borderline of breast size (in before "bustline" joke) that seperates /e/ from /d/?
When it stops being funny or sexy. :)Tough call really. I'd say around Eiken level, but eiken art flies in /e/.
Personally, I think the most for /e/ is when the girl can hold her arms out and cradle her breasts by bending her elbows (XP-tan in the OP pic is KINDA doing it with her left arm, the arm on the right side of the image).
>>378283Kinda like this, but imagine her hand resting on her nipple.http://orz.4chan.org/e/res/378046.html
Anything up to the attached is fine. After that, you're going to /d/.
>>378404Is that larger than OP?
EIKEN IS THE LIMIT! PAY ATTENTION! SAGE!
>>378438Then perhaps we'd need better examples, seeing as Eiken it pretty fugly.