i personally think group scenes are a tad overrated....can work if it's developed right in the story, but 1 on 1 generally works much better in terms of storytelling, intimacy and believability. group scenes most often times are just a gimmick trope that requires a level of suspension of belief that takes me out of the immersion of the scene.
most of the time, you have at one person not fully getting satisfied or left out not doing very much. In terms of games and stories, a group scene usually happens at the end when the author runs out of ideas, can't resolve the story or has to work the MC in the middle of a lesbian couple.
A good example is like the ending of treasure of nadia where it's one guy and like 10 girls piled on top of each other like gym mats. Like even if you were to imagine a world where there is only one guy and his magic dick could attract and satisfy any remotely attractive female, it just doesn't look fun
but that's just me.