(Christmas Special) Two Geniuses, as Christmas Presents (Patreon)

Merry Christmas, everyone! And have a special Christmas artwork~While having an experiment, The Herta and Ruan Mei was suddenly kidnapped by 'Stelle', where both of them got turned into a pair of Christmas presents in Stelle's room on the Astral Express. Turns out that the 'Stelle' that wrapped them up was actually Sparkle, disguising as Stelle, until moments later, the real Stelle came back and decided to unwrap them both a little.

(Alt versions also available.)