HUNTA-527 Thanks to my sister-in-law, I can do naughty things every day. - A hikikomori brother-in-law whose parents remarried and decided to live together is a libido monster! - Masturbation without ending every day. - My sister-in-law who sees it and feels fear. - He can't sleep because he's worried about when he won't get his hands on him... - And to her horror, her sister-in-law hunts for underwear...