Mated to my professor stepbrother

Is this really Harem? Doesn't look like it. . .

please update the remaining chapters

"Hahaha, why don't you just sit on him if you want that seat badly?" Another voice came into the room, and it was the rest of their friends. The same person who talked propped his arm on Morikawa's shoulder and grinned at Yukari. "Hello, miss. Are you friends with that league of beauties always visiting Keita?"

This was a big hurdle in their plan.