This was first written for the Sebklaine Bang on tumblr and I've decided to post it here. I hope you all enjoy it!

Warning: contains slash, threesomes, mature content.

From the start, Kurt had known it was a bad idea. He had known but he just couldn't resist. He couldn't resist the harsh, bruising kisses, the long hands that gripped his hips so strongly that he had bruises the next morning, the lust-driven black pupils that took over burning green eyes.

He couldn't resist the temptation that was Sebastian Smythe. He was addicted and he knew it. Even now, when Sebastian was pulling on his clothes, panting hard from their earlier activities, he wanted more.

"Leaving already?" he asked. Cool green eyes skimmed over Kurt's pale form.

"Don't you have a boyfriend to get back to?" Sebastian asked, almost cruelly. "I'm sure he's just dying to know where you've gone off to instead of warming up his bed."

The words stung and Kurt's peaceful expression turned into a scowl. He shoved the sheets off of him and grabbed his robes that had been bundled up on the floor. He turned away from Sebastian to get dressed but that didn't stop him from saying what was on his mind.

"You always have to be an arse, don't you?" he spat. "You never complain but as soon as we're done, you have to go and bring him up!"

He turned around to face Sebastian but the other Prefect had silently disappeared. Typical. A scrap of parchment had been placed on the bed. Written in Sebastian's untidy scrawl, it read:

You know where to find me for next time.

Kurt's hands shook slightly as he picked up the note. Next time. There was no doubt that there would be a next time. He was unable to say no. Sebastian was too addicting.

He knew that he should feel guilty about cheating. Blaine didn't deserve this but Kurt couldn't bring himself to give up Blaine. He was a selfish person. Still, Kurt knew it wasn't right. He couldn't continue this and not expect everything to blow up in his face. Finding out about Sebastian would crush Blaine.

And yet, Kurt didn't feel the slightest bit of guilt.