Standard convention is that, in fiction, there should not be two quotes from two different characters in the same paragraph, which means that when a different person starts speaking, it should always start a new paragraph. So, \"How much do you want it," she teased. "Very much please," he begged.\ is incorrect, and, in my opinion, confusing. It should be spaced:
"How much do you want it?" she teased.
"Very much please," he begged.
Since it's difficult to indent on the internet, I like to put a new line between line breaks, like this:
"How much do you want it?" she teased.
"Very much please," he begged.
I think more white space makes it easier to read and less confusing.