Since this is an indie game with adult content, it is not available on the Google Play Store. To avoid malware, you should look for these versions on reputable community hubs rather than random "APK download" sites:

: The original game is developed for PC (DLsite). Android versions are almost exclusively unofficial ports made by fans or third-party translators.

Be extremely careful with sites claiming to have a "Teaching Feeling Dev APK" that don't have a community review section. These files are frequently used to distribute: : Apps that spam your phone with notifications.