Simon on his knees in the desert...
Don't know if anyone sees it this way. But to me, the writers wanted to troll all of us who have enjoyed a "moneyshot" in a porno. Not to mention those of us who occasionally enjoy "watersports" scenes. Seeing Simon with his tongue out getting ready to receive it, and finally getting it, was kind of disturbing.
Well played, Inbetweeners, well played.