He's only doing it because he thinks Itonaga will feel more comfortable if he is wearing a blindfold (because he seemed so uncomfortable when they were going to do it the first time until he was wearing it)
Same but maybe he is just really doing it for pity and can’t look at his eyes? He feels bad for what he did but man if that’s actually the case this ain’t it.
I think that's hard for him to see Itonaga's tears or he thinks that it's hard for Itonaga to look at someone who hurt him so much.
And Sanada liked him when they were in middle schood, coudn't understand it and that's why he bullied him. He better be good from now on and make up for everything.
Another possibility might be that the seme actually feel embarrassed himself of him staring at him, since he can't read his expressions?
I dunno...
If Sanada likes Itonaga's eyes, why does he blindfold him during sex?