Once again I must thank you for bringing my fantasy to life! I'm happy you've shared it here for others to enjoy as well.
As you might have guessed from my avatar, the fact that I am both a quicksand fan and a fan of Ghostbusters led me to consider the sinking possibilities of the river of slime from Ghostbusters II.
The "psychomagnotheric" ectoplasm responds to human emotional states, both positive and negative. It can summon ghosts, bring inanimate objects to life, and can move and flow to envelop objects. Direct contact with the slime has the effect of filling a person with the emotions that it stores.
My concept for this scene was that this group of Ghostbusters investigate the river of slime in an abandoned subway station. The slime flow has become dormant and inert, but one of the team is horny and preoccupied with sexual thoughts, and the slime reacts accordingly!
Although the 2016 reboot movie features an all-female team, these lady Ghostbusters are actually characters from the Ghostbusters comic done by IDW. It features the original 80s team as well as several additional characters, and is set in the same continuity as the original films (as well as Ghostbusters: The Video Game).
On the right, on all fours: Kyle Griffin (from the Extreme Ghostbusters cartoon series, and the IDW comics)
On the top, clinging to the railing: Jenny Moran (from the IDW Comics)
On the left: Lou Kamaka (from the IDW comics)
At the bottom, in the foreground: my actual girlfriend, a fellow Ghostbusters fan... and fan of tentacles! She was delighted how this turned out.