This could be Mei next to Deku, but I'm not sure.

Acid burns are worse than regular ones, if he preserves his fingers he can consider himself lucky, very lucky

He needs to get hard before they start foreplay.

He should have been born with the "soda excretion" quirk.

Guess she's a squirter.

At least he was using the proper pair.

kett_er said:

Acid burns are worse than regular ones, if he preserves his fingers he can consider himself lucky, very lucky

He probably managed to mitigate it before it got too bad by pulling out and hardening.
Still definitely not something that would be enjoyable in any way.
Seeing how Mina doesn't look too worried, the damage is likely mainly superficial-ish. Atl not permanent damage.

It could be worse he could've went down on her.

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