They are too stunned...and excited.

Sarah, Felicia and Lisa stood there with open mouths as her sister degraded herself in front of a whole crowd, something they didn’t expect from their youngest sibling. Bro A was even more enjoyed by the sight of the 3 sisters down the stairs than the sister that is offering herself so enthusiastically in front of them. He watched as Bro D sat there on his knees, his stiff rod pointing straight at the writhing girl in front of him, enjoying the urgency in her eyes. He gave Bro D a green marker with a ceremonial gesture and saw Beth’s eyes follow the marker, her smile broadening, knowing it couldn’t be long now.

Lisa couldn’t decide what to do, but couldn’t stand by idly and stumbled towards the stone where her sister was about to be taken. As she arrived at the top of the stairs, she got caught by slender, long Bro B, who stopped her before she could reach her sister. She tried to turn her head to see who stopped her, but couldn’t and didn’t try too hard anyways. The more that happened, the more her resistance and unwillingness subsided and curiosity took over. Still, for her little sister’s sake, she still tried to struggle while she softly called Beth's name.

“Hey, leave Lisa alone, you ass!” Sarah said and she and Felicia tried to free Lisa from her trapper. But before they could reach her, a pair of hands caught one arm of each girls.

“Heeeey, what do you think you are doing?” Sarah yelled, while looking back. But she at first she missed the person who held them. Bro C, who held them, was more than a head shorter than tall Sarah and even a bit shorter than Felicia, but quite strong.

Both girls try to squirm out of Bro C’s grip, but didn’t succeed and looked back at Lisa. Again something astonishing happened that let their mouth drop open. Bro B, still holding Lisa, felt her struggles lessen while she watched Bro D open the marker with a loud click. Holding the girl with one arm around her middle, he started to undo the strings of her top, which kept hanging on top of her breasts for a bit. As the letters DKM were slowly written on Beths lower back, Lisa watched her sister enjoy the marker on her skin and didn’t seem to notice Bro B went on and stripped her of her pants too. After that he also dropped his shorts, his erection sliding between Lisa’s ass crack on it’s way up, stopping against her back while he resumed holding her close.

Felicia and Sarah couldn’t believe their second sister was stripped naked without struggle, no doubt going to be fully filled with DKM seed like Beth was going to be.

“Lisa! What are you doing?!?” Felicia called out, but Lisa gave no reply. Bro B slowly let his captive pull them toward the Stone, where Beth noticed the undressing of her sister and smiled at Lisa joining her on the plateau, stark naked. Her sister was also quite a sight and should not displease the onlookers while performing. Lisa strolled up to the stone and got her arms released which she put on the stone, leaning in towards her sister.

“Beth?” She said softly, while Bro B started fondling her breasts with one hand, her pubic hair with his other hand and went softly kissing her back.