Looking for SessxInu fic

[hikari_no_kurai]

Hi, I'm looking for a SessxInu fic that I read a long time ago and haven't been able to find again. I'm pretty sure it's an AU because I think Inutaisho is alive and Sesshomaru and Inuyasha grew up in a castle together. I think Sesshomaru is a bit of a playboy in it and Inuyasha has grown to be in love with him. I distinctly remember a scene where Inuyasha catches, or finds out, that Sesshomaru slept with Kagura while they're courting and sleeps with someone else in retaliation (an OC I believe). And Naraku may have been Sesshomaru's past mate who hurt him somehow.

If any of this sounds familiar, please let me know! Thanks!