if you look at it closely you can see that based on his facial expressions and body language izuku is tired after being drenched, and is leaning into mirio, more specifically his shoulder and arms are leaning meaning that mirio is holding him upright by his hand
Mirio is not my favourite by far, but I miss those days when heroism meant protecting a child's body and quirk, no matter the cost, rather than harvesting her for parts like she's a magic unicorn.
Life is unfair, but the people you meet can change the balance.
An insight about Eri, Mirio and Izuku, and how Eri isn't a 'plot device'. Her relationship with Mirio and Izuku is layers deep and I'm here to show what I got from it piece by piece. Please take a moment to read it.