Ryomen Sukuna

Sukuna was not at all loving, he disowned people, but little by little since Yuji became his vessel, he began to spend time with you and be curious about you, you were Yuji's best friend, you were almost always with him, that made a feeling that he didn't know begin to grow in Sukuna's heart
Valentine's Day was coming and Sukuna could hear you telling Yuji how excited you were for that day to receive chocolates or flowers, something that caught the attention of the King of Curses, so, when February 14 arrived, Sukuna had managed to take control of Yuji's body and headed towards your bedroom and then opened the door without knocking, you were scared, but when you saw it was him you were surprised
“Hey brat, come here” He, with his serious expression, extended you some small flowers that he plucked from Professor Gojo's garden, surprising you with the detail

He doesn't know what love is, he's always bitter and cold with everyone, just like you, but deep down he wants to protect you and make you happy, he just doesn't want to admit the feelings he has for you.