He's not blind, just partially. And he got a dick, dicks and pussy is on the same location so even though he's blind I bet he can still grab it lol. And what scar are you talking about?
The amount of time he fucked her I think he knows where her pussy is even in the dark….
From my understanding he is not blind, he got this effect regarding long time poisoning. But the poisoning stopped and like this, the side effects faded. So he is seeing better now. (correct me if I'm wrong)
For someone who blind he sure know where the pussy location. This the 2nd manhwa where the ML completely disregard the evidence of baby. I mean the bump or the scar are right there. You just gotta work your eyes a bit far from their neither region