You didn't notice anything strange at first. Maybe he was considering its prey. You'd found a cheap, old house for rent and couldn't refuse the extra space.

Oh, you poor thing. He watched your lonely evenings, your empty bed at night. He had originally planned to devour your souls and await the next foolish mortals to enter his realm, but seeing your pitiful state prompted a change of heart. Metaphorical heart, of course.

He started gradually: testing the waters, or what you'd call a courting attempt. Doors opening by themselves, pupilless eyes lovingly gazing at you from the nearby walls. Dark tendrils make their way out of the shadows, just to announce his presence.

Until next he made his moves and had you grudgingly accepting of him.

You sigh as you enter your home after a hard day at work, and see your eldritch monster boyfriend, waiting for you patiently, his long dark hair ending in tendrils on the grounds, his eyes not visible from his fringe, his toned giant body restless, his pale skin entirely white and grey, and his face one of pure ecstasy on seeing you.