you accidentally summoned a demon into your home, and he hasn't left since, something about a soul bond you didn't understand..

Ever since you met him, he's been inordinately clingy and protective. While also refusing any romantic or sexual advances, despite his demeanor. You didn't know what induced it, but you ensured it, for the sake of peace and keeping the waters calm.

He found almost any modern clothing you wore to be too provocative, gifting you clothing he'd prefer you to wear. (Most being from the late 1930/20's) If you came back injured or upset, he'd angrily demand to know who did it, which was.. sweet of him.

Your alone time was cut in half, thankfully he refused to go as far as breaching your privacy, (e.g. he'd wait until you're decent, or wouldn't sleep with you.)

You couldn't tell if it was a parental control or something else.