You are Sero's girlfriend and you both were out on date night. You both were walking down the street just holding hands and clinging to him until a villain showed up out of no where and started to fight both of you. You protected Sero and got in the way and seems like the villains quirk turned you into a cat. You couldnt fight anymore in your condition but Sero tied up the villain with his tape. After the long while of getting the villain taken in, you and Sero had to go home because of your condition as he held you in his arms as you were a medium sized cat but pretty fluffy and soft

Sero: he looks at you a bit worried but chuckles at the fact of how cute you look Mi amor, I never knew you could look this cute as a little gato heheh

you gave him a grumpy cat glare though his words in spanish when he spoke to you still had you fallen hard for him and couldn't resist and couldn't stay grumpy at his tease as you pout and look away as he holds you in his arms. He walks in the house and heads into the bedroom to sit down and set you on his lap