User blog comment:B214/Light Novel Volume 16 spoilers/@comment-162.202.198.72-20131019225559

The powerup that Koneko has right has Issei in a Fantasy Land right now because he is probably offering the Oppai God a offering to let Koneko stay in this form, and Issei is probably saying please "Oppai God make Koneko keep his huge Oppai for me in fact can you make them bigger". I am rather surprised of how big she is but it must be part of her family heritage because Kuroka is huge, and I wonder does Nekomata mature differently than Humans or Devils because it seems to be the case for them.