I love the idea of longer and more realistic sex scenes, but as some said, the small sexual interactions are a must too, and i think you can add them in a way that doesn't require a lot of effort, you can add some short scenes with some small random variations. Like maybe Emilia wakes up the MC on X day with a BJ, on another day she wakes him up with a handjob, you can use like 80% of the same scenes with smaller variations in comparison to a whole new sexual encounter.