Doujinshi BL

Hello! I wanted to ask really quick question! About a DJ BL? I forgot it again the name
But the Storyline is about a couple who I guess was at that point in there life??? And suddenly they met they’re future self, but they’re still together and had sex with each other’s future self to teach them a lesson ? I don’t know it was a quick read an I totally forgot it until now. If anyone could help me ? ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄