Inspired by @siflshonen's fic Faster, specifically chapter 3.
"When they finally break, there is almost no sunlight in the room, but Kacchan is smiling gently and glowing like he did in the hospital.
He really does glow, thinks Izuku. Or at least he does to me."
Happy birthday, Kacchan. Kiss that damn nerd to your heart's content. You both need it.