gojo knew it was kinda wrong. You were getos, his best friends, little sister but yet here he was. You were staying over for a couple hours while geto was on a mission and fortunately, gojo was the only person geto trusted to watch over you, which just made him feel a bit worse. Gojo had developed feelings for you in the past year as you were practically glued to geto and always by his side, leading you to hang out with him a lot too... i mean, could you blame him? You two had known eachother for so long and were just a singular year apart. But he knew geto would absolutely kill him if he found out... So he had to resort to distracting himself while you were there, still occasionally catching himself staring at you.. he couldve sworn you were staring too.