some hints

code/game/objects/items/dna_injector.dm

@@ -16,6 +16,16 @@
 
 	var/used = 0
 
+/obj/item/dnainjector/Initialize(mapload)
+	. = ..()
+	register_item_context()
+
+/obj/item/dnainjector/add_item_context(obj/item/source, list/context, mob/living/target, mob/living/user)
+	. = ..()
+	if(isliving(target) && target.has_dna() && !used)
+		LAZYSET(context[SCREENTIP_CONTEXT_LMB], INTENT_ANY, "Inject")
+		return CONTEXTUAL_SCREENTIP_SET
+
 /obj/item/dnainjector/attack_paw(mob/user)
 	return attack_hand(user)
 
@@ -524,6 +534,12 @@
 	var/research = FALSE //Set to true to get expended and filled injectors for chromosomes
 	var/filled = FALSE
 
+/obj/item/dnainjector/activator/add_item_context(obj/item/source, list/context, atom/target, mob/living/user)
+	. = ..()
+	if(istype(target, /obj/machinery/computer/scan_consolenew) && used)
+		LAZYSET(context[SCREENTIP_CONTEXT_LMB], INTENT_ANY, "Recycle")
+		return CONTEXTUAL_SCREENTIP_SET
+
 /obj/item/dnainjector/activator/inject(mob/living/carbon/M, mob/user)
 	if(M.has_dna() && !HAS_TRAIT_NOT_FROM(M, TRAIT_RADIMMUNE,BLOODSUCKER_TRAIT) && !HAS_TRAIT(M,TRAIT_NOCLONE))
 		M.radiation += rand(20/(damage_coeff  ** 2),50/(damage_coeff  ** 2))

code/game/objects/structures/bedsheet_bin.dm

@@ -65,6 +65,13 @@ GLOBAL_LIST_INIT(double_bedsheets, list(/obj/item/bedsheet/double,
 	if(bedsheet_type == BEDSHEET_DOUBLE)
 		stack_amount *= 2
 		dying_key = DYE_REGISTRY_DOUBLE_BEDSHEET
+		register_item_context()
+
+/obj/item/bedsheet/add_item_context(obj/item/source, list/context, atom/target, mob/living/user)
+	. = ..()
+	if(iscarbon(target))
+		LAZYSET(context[SCREENTIP_CONTEXT_LMB], INTENT_ANY, "Prepare Surgery")
+		return CONTEXTUAL_SCREENTIP_SET
 
 /obj/item/bedsheet/attack(mob/living/M, mob/user)
 	if(!attempt_initiate_surgery(src, M, user))