romanticbeginneruniversal
Maus / Mäuschen
/maʊs/, /ˈmɔɪsçən/
Mouse / little mouse (term of endearment)
When to use it
Hugely common German pet name. Don't think 'rodent' — think 'sweetheart'.
In conversation
—Schlaf gut, meine kleine Maus.
“—Sleep well, my little mouse.”