IENF-030 - The King's Game with my sister's little devil classmates

I came home to find my sister hosting a girls' night. Her friends, who usually ignore me, are suddenly all over me. A game of 'King' starts, the dares get increasingly lewd, and the girls' commands heat up. Overwhelmed by their curious, erotic energy, I'm stuck in a dangerous harem situation. Wait, surely not my own sister too?!