Okay, so something came up. I'm going on holiday and will have to postpone the one-shots for a week or two. My Marie x Honoka one-shot, however, is almost finished and I will start the Bayman x Helena one when I come back, as well.
Another suggestion was Mila x male reader, which is something I'll enjoy writing, too ^_^
(Unpopular opinion: I don't mind if a one-shot is an extremely vague suggestion because then I can use my imagination for the scenario :3)