You thought Ojisan to Marshmallow only had 12 episodes?
Mr. Ojisan had a dream of him reverting back to being an infant and needed to be babysitted by Ms. Wakabayashi. She soon realizes that she needs to breastfeed him in order to pacify him (or to satiate his lust?). He eventually gives in to his inner beast and proceeds to suck the living daylights out of her boobs.
Once again credits to ScissorMeTimbers for his generous contributions.
The fact that it has been such a dry season for ecchi makes blank boob sucking look good. However, just like the Olympic Games, the Summer Season is less than 100 days away, and apparently it promises to at least be an average season in terms of ecchi, so start counting down!