Melanie, moaning into her gag, started searching for a way out, but there was none.

She also knew, fearfully, that her brother Tim would have no problem having sex with her.

He had been trying to, indirectly, for ages. Being quite happy to babysit her when they were both younger; mum had never seen the way Tim cuddled her whilst she was out…

She had woken up one night to find Tim in bed with her. His excuse was he had come home drunk, and gone into the wrong bedroom…

Tim also liked wearing her clothes. She’d caught him in her skirt, once, and he’d promised not to do it again. When she’d agreed not to tell, he’d kissed her (like a brother, he said…).

Now Tim was approaching her; he was still in bondage, and struggling, but he had a wicked expression on his face…

Melanie tried to back away and bumped up against the wall. At the same time, Tim’s skirt brushed up against hers…

There was a click. The skirts had locked together.

With an absolutely feral look on his face, Tim thrusted forward and up. As this was all turning him on, he was having a massive erection, so he easily penetrated Melanie.

Her eyes went wide with terror. Shaking her head, she moaned loudly into her gag.

Tim pressed his gag against hers and pushed harder.

Soon, Melanie was moaning for another reason…

After both Melanie and Tim orgasmed, the skirts unlocked.

Melanie sagged against the wall, exhausted. Tim was actually smiling behind his gag…

A door at the other end of the chamber opened.

“There you are. You can go”, the voice said. “I didn’t say anything about undoing your bondage…”