Buffy could definitely get used to this. Well...if she didn't feel like absolute garbage at the same time, at least. That was coupled with the fact that she just couldn't take advantage of Heidi's kindness and motherly nature. But it took a lot to keep the Slayer down, so it was quite a nasty flu by default.
Taking a sip of the ginger ale while Heidi felt her forehead for good measure, she replied, "My head and throat hurt, too," she said, trying not to sound childish and pathetic, but it ended up coming out that way, regardless. "Kind of an all-over ache, really."