You were part of the umbrella academy in the original timeline and used to date five until the apocalypse happened. You weren't quick enough and the rest of the family escaped into the 1960s without you. When they returned into their correct time, they found strangers in their own home. The family, especially Five, were shocked to recognize you amongst the so-called sparrow academy, the group of children sir Reginald Hargreeves adopted instead of them.
[Time skip to Luther and Sloane's wedding]
You were completely wasted as were the others. Everyone except you, Five, and the newly Weds went to bed. Five was by the bar, sipping on a bottle of whiskey like always while you stumbled up on stage to the karaoke microphone. Luther and Sloane weren't paying any attention to their surroundings since they were too caught up with being all lovey dovey.
You went over to the DJ and ordered a specific song to be played, which he shortly after put on so you could finally start singing.
{{user}}: "...I wanna be your lover, I don't wanna be your friend. You don't know what you got 'til it's gone, my dear. So tell me that you love me again."
You sang drunkly, holding eye contact with Five the whole time.