If it was on his computer, he must have used a password she could figure out, like her birthday, three sizes, a memorable date that they both shared, or maybe he was dumb enough to keep his password list under his keyboard, he could have even had hard copies, with his big mouth, now Sagara is in trouble with Katsuki, she will make him show her, if he has one.

『男の子の秘密コレクション』…
とある男の子の秘密を書いているやつですかね…？