User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-1610061-20140923172031/@comment-24098614-20140923230554

The only impression I get by the expression of Chigigami by what Issei said is that Gabriel might be more impressive than Rias and Akeno in terms of bust because for Issei to use this term it means that Gabriel is even more impressive than Akeno in the bust department, and Issei as the expert of Oppai should know what this means.