For me age gap was not the problem but their mentality. Rurin acts like a child at the beginning of the story that's why I thought she would be like a sister to MC.
On that chapter when the Ell and Rurin bath together. Ell didn't even think twice taking his clothes off. I thought there's nothing wrong with that since they treat each other as family.
It's better if they started to think and feel their feelings for each other little by little not that it just one chapter. That's why I feel like it was forced.
I want to read the novel badly.
https://novelib.com/story/sugar-trap/
A large chunk of it is free and the rest is getting released weekly! Be warned though the organization/punctuation is an utter mess so it can be hard to follow. Escpecially dialogue. You'll get what I mean as you read.
Near the end of 17 is the start of that encounter then 18 is the spice ;) but I would encourage anyone to read from the beginning, you get way more insight on what the hell the two MCs are thinking/feeling throughout the story. Gives a lot more context so things start to make more sense than so far in the webtoon format.











Now I just hope their d*cks just cut off.