His marks will be red.
AU: A teenaged Severus has just come into his vampire inheritance and has 2 months to find his mate. Add this in with the fact Voldemort is trying to recruit him and hes stressed. Oh yeah, and his mate is none other than our resident werewolf, whos wolf has also chosen Severus to be its mate.
In my story, vampires are not affected by silver, but werewolves still are.
Remus POV
I stood on the platform in front of the Hogwarts express. Dumbledore had arranged it so I could board early and have my own carriage (only one other person would be in it) so my infliction wouldn't get any worse. As I stood in front of the train with my luggage in my hand, my mom moved in to hug me. I had to pretend I didn't see her start to cry when she heard my intake of breath and whimper at the contact. Its not her fault, nor my dads (who just smiled sadly at me). They don't understand it. I don't understand it much better than them and its my life. Not only was I in pain due to the huge, constantly bleeding gashes on my legs (which id personally inflicted, accidently of course), but it was mating season. And I didn't have a mate. Therefore, any time anyone touched me, I felt pain. Pain worse than the Cruciatus. And I couldn't stop it. So I didn't touch anyone. I wonder how James, Sirius and Peter will take it. I hope they don't mind. I hope they still want me around. Maybe ill finally be too much of a monster for them to deal with and they'll turf me out. I hope not. I smiled a strained smile at my parents and got on the train, with the promise to write if and when I found my mate. I headed down to the first compartment after the conductors office. No one ever ventured up here so I was guaranteed not to get into contact with anyone. I walked into the small carriage and immediately smelled another being. Over in the far corner was a boy, but he had his hood up and was bathed in darkness so I couldn't see who he was. When he offered no greeting I sat down and got myself comfortable. It would be a long and lonely ride. My inner beast kept telling me to go over to this stranger but I ignored it. I must have fallen asleep because when I awoke, we were at Hogsmeade, my robes had been spelled on, and the mysterious darkened stranger was gone.
Severus' POV
I got to platform 9 ¾ early. Earlier than even Dumbledore, who I had to stand and wait for. Hed arranged me to share a carriage with only one other person, whom he assured me was not affiliated with Voldemort in any way, so I would be safe. That solved one problem, but didn't solve my other. A week ago was my birthday, and I came into my inheritance. I was now a full blooded vampire. Which meant I had a mate. Oh it gets better. I have 2 months to find said mate, or ill die. Wonderful. Although it did mean that I can now drop my glamour. I had been gaining my inheritance slowly since last year so had to wear a glamour to hide it. Now it was fully through, I can take off the glamour. My hair will no longer be greasy, but long and smooth like silk, tied at the nape of my neck. My nose will no longer be hooked, it will be straight. I will be taller, faster and more handsome. I did have to attract a mate after all. I sighed, I really didn't know what I was supposed to do to find him. I knew it would be a male because that's what I was attracted to. Females just didn't do it for me, far too curvy. I chuckled to myself as I boarded the train and sat in the farthest compartment from the doors. I didn't turn on the lights, I didn't need to, it wasn't dark, but I did put up my hood to hide my face from the one thing that would shatter my isolated journey. The other person to share my carriage. I didn't have to wait long before I smelled a delicious smell. It smelt of pine trees, apples and home. It made me feel all warm and gooey inside. But if anyone asks, I did not say that. In that moment, a slightly timid boy entered the compartment. I recognised him as soon as I looked at him. Remus Lupin, Gryffindor. But why was he here? Why not with his marauders? Because he's not theirs anymore. What? Why did I think that? This was getting strange. He looked over at me so I averted my gaze to make it look like I was sleeping. He then got himself sat down and soon enough, fell asleep. This gave me chance to look at him properly. His tawny hair was already going slightly grey but rather than looking silly, he looked endearing. His eyes, which I knew were the deepest chestnut brown, were framed with long dark eyelashes and his cute buttoned nose lay upon a pale and scarred face. I wished could reach out and trace the sca…. No, I don't. Stop it Severus, get a grip. When we arrived at Hogsmeade, he was still asleep so I spelled on his Hogwarts robe and quickly fled the compartment and the train before anyone else saw me. My vampire was screaming at me to go back and protect him. But I wasn't sure why, or what he needed protecting from. Oh well. Ill see soon enough.