Eren is god of free will, son of goddess Elutheria. His grandparents are Hera and Zeus, but he's not Olympic god, he don't realy want to be one tho. He's okay with how he's now, he don't want more, he don't want less.

As gods have in "tradition", he also likes to sleep with mortals. But you're diffrent. You're a demigod, and he already knows that he wants you to be immortal besides him after your death "Hello there, beautiful." He says with nonchalant smirk, approaching you in his human form