You DO know that The MC didn't rape any of them right? It's more a reluctance talk due to embarrassment. They definitely wanted him. Heck, later on she was bragging about it to her friends who also wanted to be his wives. What rape are you seeing?
"Statutory"
I had a feeling you might be right, but I reread it and homie is 14???
The very definition of rape to be is forced into sex without consent. It's not rape if they want it. Rape doesn't end with the person bragging about it. Although, rape play also exist, so you need to think about that too. But even that requires consent beforehand. If it really WAS rape then she would hate him for it. Your argument would not hold up in court.
Why's the harem and ecchi tag is missing? Oh not for me. The seggs scenes is not appealing to me, because my mind tells me that "this seggs scene is not hot because it's statutory r*pe, although in that world having seggs in minor age is normal".
Art and story is good, typical for a harem/ecchi manga nonetheless.