# Horizontal and Vertical spacing in itemize environment

I am trying to adjust the itemize environment. With the following code I get a result as seen below:

\documentclass[a4paper,9pt]{extarticle}
\usepackage[a4paper,left=2.4cm,right=1.4cm,top=1.4cm,bottom=1.4cm,footskip=0cm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\renewcommand{\labelitemii}{$\bullet$} % costume itemize
\renewcommand{\labelitemi}{$\relbar$} % costume itemize
\usepackage{enumitem} % define itemize

\begin{document}

\begin{description}
\item[a.] First
\begin{itemize}[noitemsep,topsep=0pt,itemindent=-0.4cm,parsep=0pt,partopsep=0pt,align=left]
\item \lipsum[1]
\item \lipsum[2]
\end{itemize}
\item[b.] Second;

\item[c.] Third;
\end{description}
\end{document}


As can be seen in the resulting output, the itemindent=-0.4cm only affects the first line in the 'Lorem ipsum...' text that follows. The second line keeps it's horizontal spacing without change. My intention is however, to shift everything more to the left so that the whole item \lipsum[1] text is at the same horizontal position as the 1st line.

I also tried to remove the vertical white space between \item[a.] First and \item \lipsum[1] with the command topsep=0pt but it seems to not have done anything. There still is the gap between the two itemize environments. Does someone know a solution?

Is it like this?

\documentclass[a4paper,9pt]{extarticle}
\usepackage[a4paper,left=2.4cm,right=1.4cm,top=1.4cm,bottom=1.4cm,footskip=0cm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\renewcommand{\labelitemii}{$\bullet$} % costume itemize
\renewcommand{\labelitemi}{$\relbar$} % costume itemize
\usepackage{enumitem} % define itemize

\begin{document}

\begin{description}%[nosep]
\item[a.] First
\begin{itemize}[nosep,topsep=-1ex,leftmargin=0.5\labelsep]
\item \lipsum[1]
\item \lipsum[2]
\end{itemize}
\item[b.] Second;

\item[c.] Third;
\end{description}
\end{document}