Vol.7 of アイオンコミックオリジナル (Aion Comics Original)'s がっちり★快楽ランド anthology series. I'm too lazy to photoshop the two layers into one, so this gallery contains rendered version with texts, and a textless extracted version for translators.
digital ver: http://www.dlsite.com/maniax/work/=/product_id/RJ114643.html