looking for a bl lol

i read this bl a while back and it was about this student who stumbled upon his teachers time machine and accidentally went back in time to when their teacher was younger and they had to stay with her at her home and while being there he like falls in love with a boy student there where she teaches.

it would mean a lot if someone could fine it for me once again. my description is pretty vague but still try to find it thank you.