The Takamachi Family's Tumultuous Holiday! (Mahou Shoujo Lyrical Nanoha)

After being away for so long, Fate returns to the Takamachi household—only to find Nanoha and Hayate sleeping together!
Her jealous outburst swept up Vivio and Einhard, who just happened to come home at the same time—making for one chaotic holiday at the Takamachis.