Realistically speaking, I don’t think black coffee would kill Harrow. She drinks wine more than once, and I think it’s even specified once that it’s red; the more tannin rich and strongly flavored of the wines. Evidence suggests that, while she would in no way enjoy it, she could theoretically survive a cup of black coffee.
Therefore the question becomes: Would she? What would she do if she had to choose between keeping her tastebuds or impressing a hot barista? Could lean taut muscle dewy with sweat and steam compel her to do what God could not—finish a hot beverage?
I feel like Harrow would drink coffee BUT. She’d drink it iced, and with just enough milk (NO sugar or anything else) to make it pretty bland or at least try to counteract the bitter. Caffeine yes, flavor and temperature 0.
OR. She would enjoy the sludgiest black coffee known to man simply because of its Awake benefit and also bc she sees it as some sort of self punishment which makes it acceptable to her.