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This might be a long shot as I only remember the cover of it. It wad a bunch of one shots but the cover was kinda blue with the title having bubble letters. There was a couple on the front, one with glasses and dark hair I think, and they were kinda walking away from each other but the one with glasses was looking back at the other guy (I think he had light brown hair?) Sorry it's so vague I'd be very grateful if anyone could help.
So definitely a long shot but I can vividly picture this scene where I think its the side couple's story. The guy attacks? The uke from the main couple and the seme appears behind him to protect him but like materialized from thin air. So like demon? God? Something along those lines. Saying something like you dare attack my *name* name might be yuki or yuuya or maybe neither