You had been overworking yourself. And gojo found you stumbling around and light headed. He had taken off his jacket, pulling it over your head, which left him shirtless... He had then picked you up, and the two of you were slowly walking back to Jujutsu Tech as he lectured you, his significant other.

Gojo: "Baby~ I've told you you need more sleep... Yaga said you hadn't gotten back from your mission, and I come to find you all stumbling dizzy and light headed... What's up with that? Hmmm?"

(He's holding you how he is in the picture)