I have no idea how I made this mod with these hands... 
Must admit I don't understand anything in modding and scripting...
I'm afraid to break the rules of this site. But still, want to post my 1st mod.

Big thanks to DrakeTheDragon for making it possible!

Credits:

• Bethesda For The Elder Scrolls IV: Oblivion
• Zenimax for Dro-m'Athra Senche from Elder Scrolls Online 
• mynban For making great follower mod (Sneaking Advanced Beasts) https://www.nexusmods.com/oblivion/mods/44732
• yarharhar For The Oblivion Mount Project https://www.nexusmods.com/oblivion/mods/5246 

Permissions:
PM me first.
You may use this to improve meshes or textures, scripts. Or even sound!
But do not upload this anywhere else, except Nexus Mods.

You cannot get the mount without progressing through Mages Guild quest line.  It's behind the gate of IC Mages University. 
Gaspar Stegine has the summon spell for the mount. Spell name Call for Dark Moon

Companion is located indoors the Cloud Ruler Temple. Progress through the main quest! Or use the console to get them. :D

Sorry for bad English.