Light☆'s activites

A manga where it was about a uke who had like blond hair and was a student or smth like that and he had a teacher or tutor(seme) who was helping him in the summer holidays and hes a sadist as well...?and i think the study was about stars as uke loved smth about the stars??? pls I randomly thought of this manga but I can't find it PLS HELP ╥﹏╥

 Yaoi-Hard addickt 
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Historical / Isekai / reincarnate BL I:
https://www.mangago.me/home/mangalist/835803/

Historical / Isekai / reincarnate BL III:
https://www.mangago.me/home/mangalist/2728331/