Obviously it's senpai.
You can CLEARLY make him out because he has a butthole shown above.
That sarlac pit is pretty explanatory.
But you know, Luharis will never say that he was was the cause of that butthole.
...since we are starting to break into NSFW topics, lets bring up my terrible question.
Hentai related.
-ever have that feeling where your mind detests the hentai (or porn, for you normals.) you are viewing because of its poor quality or story, but somehow your dick is still hard and hurting you?
Does it ever confuse you?