Chinese-story at its peak: completely forgetting who the MC is, and what were his initial intentions to begin with, and just ending up writing something random "because it seems funny / interesting / sexy".
If the MC at least started off the encounter by asserting he just came to ask for a business-favor, and was then consequently played with by the twin's "enticing charm", that'd have been perfectly fine.
But instead, the author just had to completely remove the MC's agency, just so he'd be able to shoelace another girl into the story.
Writing 1 to 3 chapters a day ends up that way, I guess. Better keep browsing.