Tentacles decide to have fun(no penetration though)

"Let us go you Mistralian Hentai reject!" Yang yelled, her limbs are restrained by the strong tentacles. Ruby is in the same position too, only upside down

They thought they are going to suffer the same fate of the characters from Blake's porn(Blake sneezed again).

Tentacles, unlike its Mistralian cousins, it has no intention to insert its tentacles into the girls, merely want to see their humiliated expression.

A tentacle finally closing in towards Ruby, it slithers around her legs, she felt a tingly sensation.

"Eeeep!" Ruby squeaked, as it spreads her leg wide open, forcing her to do a split, her asshole can be seen.

She squeaked yet again as the tentacles go between both of her butts cheeks, rubbing it in between like a brush. The slimy tentacles and its suction cause shiver down her spine as it plays with her butt.

"Ruby! Leave her alone you fucking pervert! Do me instead!" Yang yelled towards the Grimm. Well, if she says so, Tentacles thought.

Two small tentacles sprout out of the water as they reached towards her rear, instead of the expected double penetration, it wraps around each of her glutes in a circle. Yang blushed at the sensation and reddens further as another comes out rub between her cheeks. Then from her distraction, she did not notice another tentacle came from the front, it then wraps around both of her breasts, fondling it roughly while twidling with her nipples.

Both sisters felt humiliated at being played with(along with some unwanted pleasure), as the Grimm have its way with them.

Tentacles would decide to let both of the sisters go later(in an embarrassing position and on the public eye of course), for now, its time to have fun.