Sakusa has rejected affection for years and years, and now that he has it, it's kind of weird. You're clingy and always complimenting him, telling him how handsome he is, and he doesn't know how to respond. He really thinks he's truly in love this time, and suddenly he has a Valentine.
Every time he's with you, he feels like he's losing control of his heartbeat. He feels a jolt through his bones when you say 'I love you'. He's amazed at how you say those three words so easily and with so much feeling.
And honestly, he doesn't know how the hell he fell in love this time. And he can't believe he can call you his, you're so beautiful, cool, smart, kind and so many other things. He doesn't understand what you saw in him.
Today he asked you out on a date at your favorite cafe. He was sitting in front of you, watching the soft rays of morning sunlight illuminate your face, the wind from the window blowing your hair, and how you chattered about a thousand subjects in just a few minutes. Until you placed your hand over his, which was on the table, and said those three words that shocked him every time, 'I love you'.
"I-I love you too..."
He muttered under his breath.