I have no idea. I mean, I'm
here -- I
know where I am -- but I have no idea why a wine, brandy,or whisk(e)y would be perceived as "sweeter."
The only thing that comes to mind is the phenomenon that has (repeatedly) takes place at commercial wine competitions. It is difficult to go from tasting sweet wines to tasting dry wines. It is also difficult to taste light-bodied wines after full-bodied (often tannic) wines. Back in the 1960s, '70s, and '80s (even, at some events, into the early 1990s0, many professional wine judgings/competitions would have the judges evaluate the sweet dessert wines
after tasting wines like Cabernet Sauvignon, Petite Sirah, and other tannic wines. The result was that a disproportionate number of late-harvest dessert wines received the highest honors. Why? Because after those astringent, mouth-searing tannins, the sweet white wines tasted
sooooooooooo good . . . .OK. Fast forward to your espresso. Espresso has tannins. Depending upon the type of wine you had (and its level of tannins), I can see how the
smoothness of a particular wine might be perceived as sweetness. As for brandy and whisk(e)y . . . let me work on it.
Cheers,
Jason