From Chibi Manga:
From head to toe, I'll make you fall for me. Say that you want me.
Serika's younger cousin, Taichi, 6 years her junior had passed his university entrance exams and until he's found a place to rent, Serika will be looking after him. Although he appears to be as pretty as a girl and a sweet angel, he's grown into a sadist devil in the time they haven't seen each other.
He suddenly hugs her and kisses her. Serika's self-control is on the brink of collapsing before Taichi, who has grown into such a splendid man.
https://www.cmoa.jp/title/142614/tab/content/