The human digestive tract is 9 meters (30 feet) long. The tentacle took roughly 3.8 seconds to go in and come out (I timed it thrice and calculated the average). This means it penetrated at the speed of a whopping 2.37 m/s or 8.53 km/h or 5.33 miles/h. Which is as fast as an average jog.
Holy shit that has to burn her ass. The sheer friction…
