Nintendo 3DS game Senran Kagura featured large breasts because the game's creator really wanted to see boobs in 3D. With that as a starting point, you can already imagine what sort of illustrations the game can inspire.
You don't have to! A recent exhibition showed a collection of 57 Senran Kagura illustrations from 50 artists. Much of it is NSFW work -- some of it is down right lewd! Have a peek in the gallery of photos from website AkibaOS, or check out the gooey art in the link below.
過激なイラスト多め「閃乱カグラ」イラスト展 服破れたり白い液体まみれ [AkibaOS]