Flower Boy Riren (Demon King Levi X Omega Eren)

(This fanfiction idea/plot came from "Flower vender" but I'm not to sure on that. Disclaimer I don't own Attack on Titan or any of the pictures shown. Also their will be smut, and mpreg you have been warned.)

Eren Yeager, was told he was one of a kind because he is an Omega. Eren was never bothered with it, but he couldn't play with other kids. So Eren would always help get flowers for his mother Carla to sell at her Flower shop. After that Eren fell in love with flowers. When he got older he started to help his mom in the shop because she got sick. When she got sick, Eren's dad Grisha left to find a cure but he never did return. So Eren's mom died a few weeks after Eren and her had been with Eren's mate .