Original? Looks like Mio and Mugi to me. Inspired by, at least.

those bushy brows can only belong to one.

It's an eroge called Kyonyuu Seitokaichou Chijoku Hakudaku Kurotaitsu ~Konna Yatsu no Okazu ni Narunante~ (巨乳性奴会長恥辱の白濁黒タイツ～こんな奴のオカズになるなんて！～) with zero doing art and character design.

Where can I find the HCG for this?

Wait, Zero drawing intercourse between humans? Didn't see that one coming.