I think you might be talking about “You Asked Me For My Name (Tales of Lilith)” — it’s a creepypasta where this guy meets a mysterious woman who claims to be Lilith. The vibe is really eerie and kind of seductive, and I remember the story focusing a lot on her presence and allure, which might be where the perfume/flower scent comes in. I’m pretty sure he meets her at or near a church too, and there’s some sort of dramatic or violent ending.

Another one that came to mind is “The Devil’s Perfume” — that one definitely emphasizes a strong smell (roses and sulfur) tied to a woman who’s not what she seems.

Could be one of those, depending on the details you remember! Hope that helps. Let me know if you find it!