Eyeofgilman08

I knew which one you were talking about, just had to find it. I'm pretty sure you meant this one, anyway... Summer With Snape http://archiveofourown.org/works/4885834

Sorry it took me so long. I knew this story, but I couldn't find it! Finally I have. Here you go! https://m.fanfiction.net/s/11466894/1/A-Weekend-a-Month

That's the one! Thank you!

In this one, Harry was in detention with Severus, when lucius came in. If I remember rightly, Severus and Lucius go into Severus's office and start kissing. Harry spies and gets caught. Harry ends up joining in, and after sex, he (Harry) wakes up and hears Severus and Lucius talking. They had betted that they could get harry to join them. Harry ends up crying, and tries to leave, but Severus and Lucius end up stopping him. I hope I'm correct on this...it's been months since I read this story, and I'd love to read it again. I've been looking but can't find it ANYWHERE! Hope you all can help! Thank you!

I'm pretty sure it's 'The needs of the many' by Rokkis ... http://www.fanfiction.net/s/5376497/.