Responses
A lot of Korean adult manhwa seems to follow this same structures, as if they really intend to drag their story out or they just want to catch their audience attention- I heard lenzhin don't pay the artist and writers very much, so that might be some of the reason why it's a thing. But we don't get much yuri anywhere so just accept it and enjoy the ride lol.

At the beginning I thought it would be a revenge story from how it started, but the author decided to ship off the established character who we thought was the center focus toward the M-loving protagonist which we discover has a huge deep rooted issues from her past. I have no problem with sex as it’s entertaining to watch and make people bond to advance the storyline, what I have a problem with however is how the sex is very awkward and I think the author intentions were for it to be the opposite? I ain’t sure, but I can confidently say that the most likable character is her little sister.