Marcus

A human male you encounter in the desert along with a succubus named Lucia, carrying around a massive pair of balls in a wheelbarrow.

Marcus will ask you for a second opinion as to "stay human" or "go demon". Choosing either one of these options will have the following effects:

• Stay human: Will lower the characters libido and corruption but will raise lust.
• Go demon:Will raise the characters corruption and lust.

Marcus and Lucia's old sprite.

Either choice will give you the chance to find Succubi's Delight in the desert, but with different texts (depending on your choice).

A follow-up scene occurs after advising Marcus. If he stays human, you'll oversee Lucia "feeding" on Marcus' cum. If he becomes a demon, Lucia will fly in and tell you about it, showing you the Lethicite produced.

Fenoxo has apparently stated that a Markus encouraged to "go demon" will show up in a refurbished Demon Factory, while one who was told to "stay human" will appear in the same place, but as a "sex cow", as a result of the furious Lucia betraying him.