you know, despite of how absolutely weird Kiyozumi's way of thinking, I'm agree that they should married and living together. based on previous chapter, Akari is feeling lonely living alone and staring to enjoy living with someone else. and I'm sure Kiyozumi doesn't have any malicious intent to Akari. she even doesn't try to molest or attacking Akari when she asleep (or at least, so far in this story. who know happened next

). Kiyozumi even carried Akari when slipped to infirmary. she genuinely want to be together and protect her. this is why I like to see their pairing
