Hiya, I'm Hibi. :sun
Since my partners haven't been answering for a while and I have a lot of free time, I've come up with a few plots. 
I put this in GIC because these can be either Free or Casual.
I do 18+. I usually don't fade to black, but if you're more comfortable with that, then we can do that.
If you're interested in any of these, just PM me any questions, concerns or a CS and we can get started. 

[s][color=ed1c24]Best friend x Best friend[/color][/s]:  MC has had a crush YC ever since they were little. One night, they go to a party and get drunk (woohoo), waking up in bed with each other with no recollection of what had happened the previous night. After making sure that nobody in the small town knows about what has happened between them, YC starts to see MC in a different light and wonders if they could ever be together sober.  

[s][color=ed1c24]Demon (M) x Angel (F)[/color][/s]: There has been a long war between the angels and demons. The demons have gotten word about angels on earth and are being sent to track them down. When one demon runs into an angel, they feel something that they've never felt for someone of a different kind. Love, along with understanding. Not liking the idea of the war, they decide to run away together and hide. The others find out and start to hunt them down. 

[s][color=ed1c24]Demon (M) x Human (F)[/color][/s]:  The King of Hell isn't satisfied with the amount of souls that he has possessed, so he sends his finest demons to collect the souls of the living on Earth. YC creates a fake identity in the human world, using the strategy to gain the human's trust before he takes their life and their soul, returning it to Hell. When he meets MC, he didn't know if he could get the job done. When he gets a message from a messenger demon that the King is angry with him, he has to make the ultimate choice. Whether to kill the girl he loves, or to face torment for a million years.  

[color=ed1c24]UPDATED[/color]:

[color=39b54a]Teacher(M) x Student(F)[/color]: YES, I put this in here. I know it's a popular pairing to do, and it usually gets old, but hey...what can you do? For this one, I'm thinking that the student makes the advances and the teacher is actually MARRIED. The student comes over at times when the wife is away, only for study sessions. One thing leads to another and they end up sneaking behind the backs of the public and start dating. *woot woot* 

[color=ed1c24]Neko(F) x Human(M)[/color]: In a society where nekos are outcasts and treated poorly, your character views them as human beings. My character is new in town and the only person who has given her a warm welcome is YC. When MC comes to YC crying and bloody, telling him that she got beat at her apartment building, YC allows her to live with him.