diff --git a/GainStation13/code/modules/mob/living/species.dm b/GainStation13/code/modules/mob/living/species.dm
index 10af3bf2ed..ca3e099e30 100644
--- a/GainStation13/code/modules/mob/living/species.dm
+++ b/GainStation13/code/modules/mob/living/species.dm
@@ -216,9 +216,31 @@
 		if(HAS_TRAIT_FROM(fatty, TRAIT_NO_BUCKLE, HELPLESSNESS_TRAIT))
 			REMOVE_TRAIT(fatty, TRAIT_NO_BUCKLE, HELPLESSNESS_TRAIT)
 
+/datum/movespeed_modifier/fatness
+	id = "fat"
+	variable = TRUE
 
 /datum/species/proc/handle_fatness(mob/living/carbon/human/H)
 	handle_helplessness(H)
+
+	// update movement speed
+	var/fatness_delay = 0
+	if(H.fatness && !HAS_TRAIT(H, TRAIT_NO_FAT_SLOWDOWN))
+		fatness_delay = (H.fatness / FATNESS_DIVISOR)
+		fatness_delay = min(fatness_delay, FATNESS_MAX_MOVE_PENALTY)
+
+		if(HAS_TRAIT(H, TRAIT_STRONGLEGS))
+			fatness_delay = fatness_delay * FATNESS_STRONGLEGS_MODIFIER
+
+		if(HAS_TRAIT(H, TRAIT_WEAKLEGS))
+			if(H.fatness <= FATNESS_LEVEL_IMMOBILE)
+				fatness_delay += fatness_delay * FATNESS_WEAKLEGS_MODIFIER / 100
+			if(H.fatness > FATNESS_LEVEL_IMMOBILE)
+				fatness_delay += (H.fatness / FATNESS_LEVEL_IMMOBILE) * FATNESS_WEAKLEGS_MODIFIER
+				fatness_delay = min(fatness_delay, 60)
+
+	H.add_or_update_variable_movespeed_modifier(/datum/movespeed_modifier/fatness, TRUE, fatness_delay)
+
 	if(HAS_TRAIT(H, TRAIT_BLOB))
 		handle_fatness_trait(
 			H,
diff --git a/code/__DEFINES/citadel_defines.dm b/code/__DEFINES/citadel_defines.dm
index 245c39f367..d558b4bdcf 100644
--- a/code/__DEFINES/citadel_defines.dm
+++ b/code/__DEFINES/citadel_defines.dm
@@ -64,7 +64,7 @@
 #define MILK_EFFICIENCY		1
 
 #define BUTT_SIZE_DEF		1
-#define BUTT_SIZE_MAX		5  //butt genitals are special in that they have caps. if there's the event there's even bigger butt sprites, raise this number.
+#define BUTT_SIZE_MAX		10  //butt genitals are special in that they have caps. if there's the event there's even bigger butt sprites, raise this number.
 
 #define BELLY_SIZE_DEF	0
 #define BELLY_SIZE_MAX	10
diff --git a/code/datums/components/edible.dm b/code/datums/components/edible.dm
index 3b4d8d7611..95ca5eaef6 100644
--- a/code/datums/components/edible.dm
+++ b/code/datums/components/edible.dm
@@ -99,10 +99,16 @@ Behavior that's still missing from this component that original food items had t
 		return
 	if(!CanConsume(eater, feeder))
 		return
+
 	var/fullness = eater.nutrition + 10 //The theoretical fullness of the person eating if they were to eat this
 	for(var/datum/reagent/consumable/C in eater.reagents.reagent_list) //we add the nutrition value of what we're currently digesting
 		fullness += C.nutriment_factor * C.volume / C.metabolization_rate
 
+	//GS13 Edit
+	var/mob/living/carbon/human/human_eater = eater
+	if(istype(human_eater))
+		fullness = human_eater.fullness
+
 	. = COMPONENT_ITEM_NO_ATTACK //Point of no return I suppose
 
 	if(eater == feeder)//If you're eating it yourself.
@@ -112,15 +118,15 @@ Behavior that's still missing from this component that original food items had t
 		if(junkiness && eater.satiety < -150 && eater.nutrition > NUTRITION_LEVEL_STARVING + 50 && !HAS_TRAIT(eater, TRAIT_VORACIOUS))
 			to_chat(eater, "<span class='warning'>You don't feel like eating any more junk food at the moment!</span>")
 			return
-		else if(fullness <= 50)
+		else if(fullness <= FULLNESS_LEVEL_HALF_FULL)
 			eater.visible_message("<span class='notice'>[eater] hungrily [eatverb]s \the [parent], gobbling it down!</span>", "<span class='notice'>You hungrily [eatverb] \the [parent], gobbling it down!</span>")
-		else if(fullness > 50 && fullness < 150)
+		else if(fullness > FULLNESS_LEVEL_HALF_FULL && fullness < FULLNESS_LEVEL_FILLED)
 			eater.visible_message("<span class='notice'>[eater] hungrily [eatverb]s \the [parent].</span>", "<span class='notice'>You hungrily [eatverb] \the [parent].</span>")
-		else if(fullness > 150 && fullness < 500)
+		else if(fullness > FULLNESS_LEVEL_FILLED && fullness < FULLNESS_LEVEL_BLOATED)
 			eater.visible_message("<span class='notice'>[eater] [eatverb]s \the [parent].</span>", "<span class='notice'>You [eatverb] \the [parent].</span>")
-		else if(fullness > 500 && fullness < 600)
+		else if(fullness > FULLNESS_LEVEL_BLOATED && fullness < FULLNESS_LEVEL_BEEG)
 			eater.visible_message("<span class='notice'>[eater] unwillingly [eatverb]s a bit of \the [parent].</span>", "<span class='notice'>You unwillingly [eatverb] a bit of \the [parent].</span>")
-		else if(fullness > (600 * (1 + eater.overeatduration / 2000)))	// The more you eat - the more you can eat
+		else if(fullness > (FULLNESS_LEVEL_BEEG * (1 + eater.overeatduration / 2000)))	// The more you eat - the more you can eat
 			eater.visible_message("<span class='warning'>[eater] cannot force any more of \the [parent] to go down [eater.p_their()] throat!</span>", "<span class='warning'>You cannot force any more of \the [parent] to go down your throat!</span>")
 			return
 	else //If you're feeding it to someone else.
@@ -153,6 +159,13 @@ Behavior that's still missing from this component that original food items had t
 	if(eater.satiety > -200)
 		eater.satiety -= junkiness
 	playsound(eater.loc,'sound/items/eatfood.ogg', rand(10,50), TRUE)
+	var/mob/living/carbon/human/human_eater = eater
+	if(istype(human_eater))
+		var/bitevolume = 1
+		if(HAS_TRAIT(human_eater, TRAIT_VORACIOUS))
+			bitevolume = bitevolume * 0.67
+		human_eater.fullness += bitevolume;
+
 	if(owner.reagents.total_volume)
 		SEND_SIGNAL(parent, COMSIG_FOOD_EATEN, eater, feeder)
 		var/fraction = min(bite_consumption / owner.reagents.total_volume, 1)
diff --git a/code/modules/arousal/genitals_sprite_accessories.dm b/code/modules/arousal/genitals_sprite_accessories.dm
index d72c59f9af..33709f6e9e 100644
--- a/code/modules/arousal/genitals_sprite_accessories.dm
+++ b/code/modules/arousal/genitals_sprite_accessories.dm
@@ -126,7 +126,8 @@
 
 //BUTT BE HERE
 /datum/sprite_accessory/butt
-	icon = 'icons/obj/genitals/butt_onmob.dmi'
+	//icon = 'icons/obj/genitals/butt_onmob.dmi' GS13 EDIT - ASS SPRITES
+	icon = 'hyperstation/icons/obj/genitals/butt.dmi'
 	icon_state = "butt"
 	name = "butt"
 	color_src = "butt_color"
diff --git a/code/modules/food_and_drinks/food/snacks.dm b/code/modules/food_and_drinks/food/snacks.dm
index a39d374f5e..48b1d65b5a 100644
--- a/code/modules/food_and_drinks/food/snacks.dm
+++ b/code/modules/food_and_drinks/food/snacks.dm
@@ -113,9 +113,14 @@ All foods are distributed among various categories. Use common sense.
 		if(!canconsume(M, user))
 			return FALSE
 
+		//GS13 EDIT, FULNESS
 		var/fullness = M.nutrition + 10
-		for(var/datum/reagent/consumable/C in M.reagents.reagent_list) //we add the nutrition value of what we're currently digesting
-			fullness += C.nutriment_factor * C.volume / C.metabolization_rate
+		//for(var/datum/reagent/consumable/C in M.reagents.reagent_list) //we add the nutrition value of what we're currently digesting
+		//	fullness += C.nutriment_factor * C.volume / C.metabolization_rate
+		//GS13 Edit
+		var/mob/living/carbon/human/human_eater = M
+		if(istype(human_eater))
+			fullness = human_eater.fullness
 
 		if(M == user)								//If you're eating it yourself.
 			if(junkiness && M.satiety < -150 && M.nutrition > NUTRITION_LEVEL_STARVING + 50 )
@@ -123,18 +128,18 @@ All foods are distributed among various categories. Use common sense.
 				return FALSE
 			else if(fullness <= 50)
 				user.visible_message("<span class='notice'>[user] hungrily takes a [eatverb] from \the [src], gobbling it down!</span>", "<span class='notice'>You hungrily take a [eatverb] from \the [src], gobbling it down!</span>")
-			else if(fullness > 50 && fullness < 150)
+			else if(fullness > FULLNESS_LEVEL_HALF_FULL && fullness < FULLNESS_LEVEL_FILLED)
 				user.visible_message("<span class='notice'>[user] hungrily takes a [eatverb] from \the [src].</span>", "<span class='notice'>You hungrily take a [eatverb] from \the [src].</span>")
-			else if(fullness > 150 && fullness < 500)
+			else if(fullness > FULLNESS_LEVEL_FILLED && fullness < FULLNESS_LEVEL_BLOATED)
 				user.visible_message("<span class='notice'>[user] takes a [eatverb] from \the [src].</span>", "<span class='notice'>You take a [eatverb] from \the [src].</span>")
-			else if(fullness > 500 && fullness < 600)
+			else if(fullness > FULLNESS_LEVEL_BLOATED && fullness < FULLNESS_LEVEL_BEEG)
 				user.visible_message("<span class='notice'>[user] unwillingly takes a [eatverb] of a bit of \the [src].</span>", "<span class='warning'>You unwillingly take a [eatverb] of a bit of \the [src].</span>")
-			else if(fullness > (600 * (1 + M.overeatduration / 2000)))	// The more you eat - the more you can eat
+			else if(fullness > (FULLNESS_LEVEL_BEEG * (1 + M.overeatduration / 2000)))	// The more you eat - the more you can eat
 				user.visible_message("<span class='warning'>[user] cannot force any more of \the [src] to go down [user.p_their()] throat!</span>", "<span class='danger'>You cannot force any more of \the [src] to go down your throat!</span>")
 				return FALSE
 		else
 			if(!isbrain(M))		//If you're feeding it to someone else.
-				if(fullness <= (600 * (1 + M.overeatduration / 1000)))
+				if(fullness <= (FULLNESS_LEVEL_BEEG * (1 + M.overeatduration / 1000)))
 					M.visible_message("<span class='danger'>[user] attempts to feed [M] [src].</span>", \
 										"<span class='userdanger'>[user] attempts to feed [M] [src].</span>")
 				else
@@ -156,6 +161,12 @@ All foods are distributed among various categories. Use common sense.
 			if(M.satiety > -200)
 				M.satiety -= junkiness
 			playsound(M.loc,'sound/items/eatfood.ogg', rand(10,50), 1)
+			var/bitevolume = 1
+			if(HAS_TRAIT(M, TRAIT_VORACIOUS))
+				bitevolume = bitevolume * 0.67
+			if(istype(human_eater))
+				human_eater.fullness += bitevolume;
+
 			if(reagents.total_volume)
 				SEND_SIGNAL(src, COMSIG_FOOD_EATEN, M, user)
 				var/fraction = min(bitesize / reagents.total_volume, 1)
diff --git a/code/modules/mob/living/carbon/examine.dm b/code/modules/mob/living/carbon/examine.dm
index 958a8b599a..fa724556dd 100644
--- a/code/modules/mob/living/carbon/examine.dm
+++ b/code/modules/mob/living/carbon/examine.dm
@@ -118,6 +118,42 @@
 		if(7 to INFINITY)
 			msg += "<span class='notice'><b><i>[t_He] [t_is] just absolutely fucked up, you can look again to take a closer look...</i></b></span>\n"
 
+	//GS13 EDIT FAT EXAMINE
+	switch(fullness)
+		if(FULLNESS_LEVEL_BLOATED to FULLNESS_LEVEL_BEEG)
+			msg += "[t_He] look[p_s()] like [t_He] ate a bit too much.\n"
+		if(FULLNESS_LEVEL_BEEG to FULLNESS_LEVEL_NOMOREPLZ)
+			msg += "[t_His] stomach looks very round and very full.\n"
+		if(FULLNESS_LEVEL_NOMOREPLZ to INFINITY)
+			msg += "[t_His] stomach has been stretched to enormous proportions.\n"
+
+	if(nutrition < NUTRITION_LEVEL_STARVING - 50)
+		msg += "[t_He] [t_is] severely malnourished.\n"
+
+	if(fatness >= FATNESS_LEVEL_BLOB)
+		msg += "[t_He] [t_is] completely engulfed in rolls upon rolls of flab. [t_His] head is poking out on top of [t_His] body, akin to a marble on top of a hill.\n"
+
+	else if(fatness >= FATNESS_LEVEL_IMMOBILE)
+		msg += "[t_His] body is buried in an overflowing surplus of adipose, and [t_His] legs are completely buried beneath layers of meaty, obese flesh.\n"
+
+	else if(fatness >= FATNESS_LEVEL_BARELYMOBILE)
+		msg += "[t_He] [t_is] as wide as [t_He] [t_is] tall, barely able to move [t_His] masssive body that seems to be overtaken with piles of flab.\n"
+
+	else if(fatness >= FATNESS_LEVEL_EXTREMELY_OBESE)
+		msg += "[t_He] [t_is] ripe with numerous rolls of fat, almost all of [t_His] body layered with adipose.\n"
+
+	else if(fatness >= FATNESS_LEVEL_MORBIDLY_OBESE)
+		msg += "[t_He] [t_is] utterly stuffed with abundant lard, [t_He] doesn't seem to be able to move much.\n"
+
+	else if(fatness >= FATNESS_LEVEL_OBESE)
+		msg += "[t_He] [t_is] engorged with fat, [t_His] body laden in rolls of fattened flesh.\n"
+
+	else if(fatness >= FATNESS_LEVEL_VERYFAT)
+		msg += "[t_He] [t_is] pleasantly plushy, [t_His] body gently wobbling whenever they move. \n"
+
+	else if(fatness >= FATNESS_LEVEL_FATTER)
+		msg += "[t_He] [t_is] soft and curvy, [t_His] belly looking like a small pillow.\n"
+
 	if(msg.len)
 		. += "<span class='warning'>[msg.Join("")]</span>"
 
diff --git a/code/modules/mob/living/carbon/human/species.dm b/code/modules/mob/living/carbon/human/species.dm
index 68d68f3d92..465b6d768d 100644
--- a/code/modules/mob/living/carbon/human/species.dm
+++ b/code/modules/mob/living/carbon/human/species.dm
@@ -1545,13 +1545,31 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 		hunger_rate *= H.physiology.hunger_mod
 		H.adjust_nutrition(-hunger_rate)
 
-
+/*
 	if (H.nutrition > NUTRITION_LEVEL_FULL)
 		if(H.overeatduration < 600) //capped so people don't take forever to unfat
 			H.overeatduration++
 	else
 		if(H.overeatduration > 1)
 			H.overeatduration -= 2 //doubled the unfat rate
+*/
+	if (H.nutrition > NUTRITION_LEVEL_FULL)
+		// fatConversionRate is functionally useless. It seems under normal curcumstances, each tick only processes, at most, 1 nutrition anyway. reducing the value has no effect.
+		var/fatConversionRate = 100 //GS13 what percentage of the excess nutrition should go to fat (total nutrition to transfer can't be under 1)
+		var/nutritionThatBecomesFat = max((H.nutrition - NUTRITION_LEVEL_FULL)*(fatConversionRate / 100),1)
+		H.nutrition -= nutritionThatBecomesFat
+		H.adjust_fatness(nutritionThatBecomesFat, FATTENING_TYPE_FOOD)
+	if(H.fullness > FULLNESS_LEVEL_EMPTY)//GS13 stomach-emptying routine
+		var/ticksToEmptyStomach = 20 // GS13 how many ticks it takes to decrease the fullness by 1
+		if(HAS_TRAIT(H, TRAIT_VORACIOUS))
+			ticksToEmptyStomach = ticksToEmptyStomach * 0.5
+		H.fullness -= 1/ticksToEmptyStomach
+	if (H.fullness > FULLNESS_LEVEL_BLOATED) //GS13 overeating depends on fullness now
+		if(H.overeatduration < 5000) //capped so people don't take forever to unfat
+			H.overeatduration++
+	else
+		if(H.overeatduration > 1)
+			H.overeatduration -= 1 //doubled the unfat rate -- GS13 Nah, put it back
 
 	//metabolism change
 	if(H.nutrition > NUTRITION_LEVEL_FAT)
diff --git a/config/entries/fetish_content.txt b/config/entries/fetish_content.txt
index 1bc9ebe968..b3448b3b30 100644
--- a/config/entries/fetish_content.txt
+++ b/config/entries/fetish_content.txt
@@ -14,7 +14,7 @@ PENIS_MAX_INCHES_PREFS 24
 
 ## Minimum and maximum limits for butt size from the character creation menu. If there's bigger butt sizes out there, change the max accordingly.
 BUTT_MIN_SIZE_PREFS 1
-BUTT_MAX_SIZE_PREFS 5
+BUTT_MAX_SIZE_PREFS 10
 
 ## Body size configs, the feature will be disabled if both min and max have the same value.
 BODY_SIZE_MIN 0.9
diff --git a/hyperstation/icons/obj/genitals/butt.dmi b/hyperstation/icons/obj/genitals/butt.dmi
index 713c0e1804..8f1a153761 100644
Binary files a/hyperstation/icons/obj/genitals/butt.dmi and b/hyperstation/icons/obj/genitals/butt.dmi differ
diff --git a/icons/obj/genitals/butt.dmi b/icons/obj/genitals/butt.dmi
index 304a8424bb..b4726bf8c2 100644
Binary files a/icons/obj/genitals/butt.dmi and b/icons/obj/genitals/butt.dmi differ
diff --git a/tools/build/build.js b/tools/build/build.js
index f8d3a9a7dd..c75a65327a 100755
--- a/tools/build/build.js
+++ b/tools/build/build.js
@@ -61,6 +61,9 @@ export const DmTarget = new Juke.Target({
     'html/**',
     'icons/**',
     'interface/**',
+    'modular_citadel/**', // GS13 EDIT
+    'hyperstation/**', // GS13 EDIT
+    'GainStation13/**', // GS13 EDIT
     `${DME_NAME}.dme`,
   ],
   outputs: [