fix slime blood not transfusing to vampires (#31314)

* fix slime blood not transfusing to vampires

* fix non-vampire slime transfusion

* santa claus but it's a guard

code/modules/reagents/chemistry/reagents/toxins.dm

@@ -47,13 +47,19 @@
 	taste_description = "slimes"
 	taste_mult = 1.3
 
+/datum/reagent/slimejelly/reaction_mob(mob/living/M, method, volume, show_message)
+	var/mob/living/carbon/C = M
+	if(method != REAGENT_INGEST || !iscarbon(C) || !C.mind?.has_antag_datum(/datum/antagonist/vampire))
+		return ..()
+
+	M.set_nutrition(min(NUTRITION_LEVEL_WELL_FED, M.nutrition + 10))
+	M.blood_volume = min(M.blood_volume + round(volume, 0.1), BLOOD_VOLUME_NORMAL)
+	M.absorb_blood(id)
+
 /datum/reagent/slimejelly/on_mob_life(mob/living/M)
 	var/update_flags = STATUS_UPDATE_NONE
 	var/mob/living/carbon/C = M
 	if(iscarbon(C) && C.mind?.has_antag_datum(/datum/antagonist/vampire))
-		M.set_nutrition(min(NUTRITION_LEVEL_WELL_FED, M.nutrition + 10))
-		if(M.get_blood_id() != id)
-			M.blood_volume = min(M.blood_volume + REAGENTS_METABOLISM, BLOOD_VOLUME_NORMAL)
 		return ..() | update_flags
 
 	if(M.get_blood_id() != id)

code/modules/surgery/organs/blood.dm

@@ -365,11 +365,13 @@
 		O.off_floor = TRUE
 		O.layer = BELOW_MOB_LAYER
 
-/mob/living/proc/absorb_blood()
+/mob/living/proc/absorb_blood(passed_id)
 	// This merely deletes the blood reagent inside of the mob to look nice on health scans.
 	// The update to .blood_volume happens in `/datum/reagent/proc/reaction_mob`
 	var/id = get_blood_id()
+	if(passed_id)
+		id = passed_id
 	if(id)
-		reagents.del_reagent(get_blood_id())
+		reagents.del_reagent(id)
 
 #undef EXOTIC_BLEED_MULTIPLIER