Commissioned: Failed Summoning by Doc000 (Patreon)

It's been a little bit since I got a regular Doc000 com, as the latest comic was tying up that channel. This is just a quick idea I had, based on some related art I've seen recently.

An elf mage is performing her first demonic summoning rite, but there was a critical detail that she overlooked. The ritual requires a vessel, a sacrificial body that the demon's spirit will inhabit and reshape into it's own form. Our elf gal didn't provide this, so the demon essence has no place else to go but inside her! She's about to find out what it's like to be a demon!

Doc was kind enough to do 2 versions, so you have your choice of Female or Futa outcome. I  suppose (since I never established this character) you could also consider the mage a Futa from the start, if that's your fancy ;)