Artist's commentary
It's Saten-san, with bigger breasts and elf ears
2015/8/1 12:06 SAI
8/1 is boob day. Therefore, here's Saten-san, with bigger breasts and elf ears!
そしてカグラ消しじゃ(｀・ω・´)ｂそんな名称があるのか知らんけど(´ヾ(:３ﾉｼヾ)ﾉｼ
With Japanese number play, 8 can be "pa" and 1 can be "i". So 8/1 is "pai" day or boob day.