the fortress has gotta be one of those places that it takes awhile to get comfortable in. it's somehow constantly always slightly too hot, and slightly too cold. and humid. but you sort of learn to get used to it even when you're constantly covered in a layer of sweat-- both from the temperature and the hard work

wriothesley is not immune to this even with how long he's been down there.. he's constantly on the move doing physical work, and he runs warm so even sitting at his desk dressed in all of his layers makes him sweat... so he constantly has a bit of a musky smell to him. maybe a bit like a warm cup of earl gray tea.... (mmm... a london fog perhaps... that would be a good cologne smell for him)
i feel like he'd smell a bit like cigarettes too. and that specific smell that comes with working on a car. metal mixed with certain oils and grease. he just sort of smells entirely like the fortress. somehow a very comforting smell even when he's got the slightest hint of a dingey basement stink to him after a hard day of work. really makes him blend in when he's down in the fortress but when he comes topside and you get close enough to him he stands out a bit from the typical fontaine perfumes that permeate the air (he does his best to make sure he doesn't smell entirely unpleasant it really is just a scent that sticks out a lot when you spend all day surrounded by more floral and woody scents)

his balls and pits get so sweaty and schmelly that when he gets undressed you get a solid whiff of them both even when standing a bit away from him. toss him a rag so he can dry off a bit (personally i'd use my tongue + face)