diff --git a/stories/mass-vore.js b/stories/mass-vore.js
index 25b6d0b..cb341af 100644
--- a/stories/mass-vore.js
+++ b/stories/mass-vore.js
@@ -7,7 +7,7 @@
 
     function digest(state, count) {
         if (count === undefined) {
-            count = state.player.stats.stomach.value / 200 + 2;
+            count = state.player.stats.digestrate.value * (state.player.stats.stomach.value / 100 + 2);
         }
 
         count = Math.min(state.player.stats.stomach.value, count);
@@ -46,15 +46,8 @@
         ],
         sounds: [
             "sfx/belches/belch.ogg",
-            "sfx/swallows/swallow-1.ogg",
-            "sfx/swallows/swallow-2.ogg",
-            "sfx/swallows/swallow-3.ogg",
-            "sfx/swallows/swallow-4.ogg",
-            "sfx/swallows/swallow-5.ogg",
-            "sfx/swallows/swallow-6.ogg",
-            "sfx/swallows/swallow-7.ogg",
             "loop/stomach/stomach.ogg"
-        ],
+        ].concat(sfxGroups["swallow"]),
         preload: [
             "loop/stomach/stomach.ogg"
         ],
@@ -99,6 +92,14 @@
                     type: "counter",
                     value: 0
                 }
+                state.player.stats.digestrate = {
+                    name: "Digestion Rate",
+                    type: "hidden",
+                    value: 0.5,
+                    min: 0,
+                    max: 1,
+                    color: "rgb(0, 255, 0)"
+                }
 
                 startTimer({
                     id: "belch",
@@ -121,6 +122,8 @@
                     id: "digestion",
                     func: state => {
                         digest(state);
+                        const rateChange = (state.player.stats.digestrate.value - 0.5) / 1000
+                        state.player.stats.digestrate.value -= rateChange;
                         let vol = state.player.stats.fullness.value / state.player.stats.fullness.max
                         vol = Math.sqrt(vol);
                         playLoop("loop/stomach/stomach.ogg", vol);
@@ -163,6 +166,14 @@
                             print(["You scoop up " + victims + " people and swallow them down."]);
                             devour(state, victims);
                         }
+                    },
+                    {
+                        name: "Rub",
+                        desc: "Rub your belly",
+                        execute: (room, state) => {
+                            print(["You rub over the " + state.player.stats.stomach.value + " prey in your guts, hastening their digestion."]);
+                            state.player.stats.digestrate.value += 0.25;
+                        }
                     }
                 ],
                 exits: {