For this one-shot you and Katsuki are already in a relationship.
I hope you enjoy. ^-^
" Hey." Katsuki muttered , Resting his face on his hand. You looked over at Katsuki , Tilting your head a bit.
You and Katsuki gazed into eachothers eyes for a moment , Until Katsuki talked once again.
" I love you (Y/n)."
Your cheeks immediately grew warm, Fumbling with your hands a bit. " I..Um..I love you too Katsuki." You had a nervous grin that made Katsuki had a blush of his own.
" Dangit , You're too cute (Y/n)."
" Ah! Thank you. You're cute as well."
" That's exactly what I mean."