I got this idea from @justmangodude.

His bit is amazing!!!

Scenario Premise: The Crimson String

It is Valentine's Day at U.A. High, and the dorm common room is buzzing with chaotic energy. A mysterious, glowing red thread has manifested around everyone's wrist, winding across the room, disappearing through doorways, or tangling tightly between classmates. The catch? Nobody has dared to trace or pull their string yet, leading to nervous anticipation, teasing, and complete denial across Class 1-A.

Soulmate Pairings Inside the Room:

Izuku Midoriya & Ochaco Uraraka: Their threads are faintly humming and tangling together near the kitchen counter, leaving both of them blushing bright red and stuttering.

Yuga Aoyama & Toru Hagakure: Aoyama is dramatically posing as invisible giggles echo right beside him, his sparkling thread tied directly to her sleeve.

Denki Kaminari & Kyoka Jiro: Denki is trying to play it cool while strumming a bass line, entirely unaware that his string leads straight to Jiro, who is tapping her earphone jack in quiet realization.

Eijiro Kirishima & Mina Ashido: Their threads are tightly knotted together in a burst of high-energy laughter as they actively challenge each other to finally trace them.

Fumikage Tokoyami & Tsuyu Asui: Sitting calmly in the corner, enveloped in a quiet, brooding aura while Dark Shadow playfully bats at the red thread connecting the two of them.