Tied up by tentacles

There was a swarm of dripping dark tentacles surrounding her. It was as if she had become ensnared in the exposed roots of a tree. She **** herself to go limp; she had learnt the hard way that struggling was pointless. Still, it was hard to lie still when the tips of two string-like tendrils were wrapping around her breasts. Her breath hissed between her teeth as the tentacles tied themselves in knots around her chest, pushing out her nipples. Then the breast-binding was complete and Robin felt more humiliated than ever as she was hoisted up into the air like a hogtied pig.

She just had to hope and pray that she was not going to be spitroasted as well.

Robin braced herself as the tentacles brought her to a stop. Her arms were tied to her sides and her legs were uncomfortably bent behind her back.

While all four of her fellow captives were kneeling on a platform in front of her. Standing in front of them was...