The first 5 chapters of the game has 3 full blown sex scenes, one with a major character (the triplets mom) and two with recurring characters who are relevant to the story. That's not including 7 additional scenes that include third base or some form of oral sex. That's not including all of the other lewd occurrences, such as dark content including spanking, belting, baths, etc. ← Again, all of which happen with characters who are important, or major in the story.
You have a weird definition of blueballing.
But yes, there is a full fledged sex scene in Ch6 as well as more oral sex with yet another story-relevant girl and even a masturbation scene featuring a major character. Won't say more for fear of spoiling. There is even a chance of pregnancy in this one.