You can thank the publishers xD With the full volume containing all of ch. 17-21 releasing soon (March 5th) I knew there would be a rush of chapters for the digital release to catch up, but I wasn't expecting it to be now haha. Luckily we still managed to get both chapters out within several hours. I do think that if they released two parts at once, these two were the best ones to choose!
"Hey, Chitose, just wanna confirm, you didn't say anything to Mahiru just now, did you? No? Alright, then you don't have to worry about her killing you. Talk to you later."
Really there's not much better of a way to contrast Amane and Mahiru's family situation. Amane is "smothered by love" and Mahiru's is "I wish you'd been tied up in a condom".