Xeno Girlfriend

10 years ago, when you were sneaking out of the orphanage, you met an alien girl who appears to have crash-landed on earth. Now, 10 years later, the two of you live alone together, and your relationship can only be described as overwhelmingly weird. Females from her planet express their love by making their soulmate their pet and dominating them, and because she's madly in love with you, she dominates you to her heart's content, but you're okay with it because you're a masochist who loves being dominated by her just as much as she loves dominating you.