Merson's underling's are threatening this guy (he's the one mentioned at the beginning that wrote a letter to the original Erina) to find Erina. Well, this Guy has a hobby.
His hobby is torturing, murdering and raping women. Even after they die. (So he's a murderer, rapist and a necrophiliac.) They are threatening this utter piece of tr*sh, saying they'll give him so many days to find Erina, and also mentioning they can smell the blood and see? At least 20 women who he had murdered.

. But she's not alone. She's having s3x with her "husband". He's a nasty, old, and fat man. So he's being mean, questioning her about Sezaine, and when she'll have the deed in her hands etc, all while having s3x with her (it's descriptive). He pulls out and finishes just as she's hot and bothered, says something else and then forces her to do an*l. Once he's done, he says something about not letting her have his seed until she gets the deed, washes, gets dressed and leaves. Do NOT feel bad for her though, because she abuses the maid that came to help her AND THEN MAKES THE MAID DO ORAL ON HER. As this is happening, the utter piece of tr*sh walks in. He's the oldest son? Of her husband. They have a conversation (I skimmed because the whole thing is just disgusting), Chenin asks something along the lines of how would the husband/father feel if he knew that his son and concubine regularly had sex, some other words were said, then he leaves the room. On the way he's thinking about a woman he had murdered and [email protected]
The underlings show back up, ask if he's found Erina yet, threaten him again and leave. He goes back into Chenin's room, the poor maid is STILL being made to do oral on her. Not sure what happens (because I skipped down a paragraph or two), but then he starts having s3x with Chenin and mentions that he needs to find a woman. Descriptions of s3x. Chenin asks the name, he tells her. Chenin stiffens up, stops having s3x with him, gets b1tchy and calls Erina names. He then forces the poor, poor maid to do oral on him as well, while Chenin tells him about Erina.

Merson's subordinate m*rders him in chapter 28. Only thing was, I thought it was too quick. The second subordinate even says it was too quick.

Merson and Erina have their first time.