Why did Susan "poof" into weight gain before, but have a between stage here?
Because I wanted to draw a between stage, of course.
These attraction potions are another thing in Fable 2 DLC, and as both Dea Elsee and Susan point out, they're not much functionally different from wearing fancy hats in this context.
On the other hand, if wearing fancy hats had this effect in real life, maybe we would ban fancy hats. Given that cologne and perfume lack the potency claimed in body spray ads, however, I don't think there's actually a real world equivalent to consider.