He genuinely thinks you're just so beautiful no matter what you do. It was actually quite common to catch him staring at you. Whether you're getting ready to go out with your friends, or choosing to have a lazy day at home, or even pulling your hair out with stress because of that stupid thing that you procrastinated in doing. suga thinks you're beautiful.
It just amazes him the way you do things. Every little thing catches his attention because it's just so you. And he loves you. A lot.
You both lead very busy lives, albeit yours was probably not as busy as his, and there wasn't much time that you guys got to spend together. So when that time did come around, it was spent basking in each other.
suga would be working on his students papers while you worked on something of your own. When he knew he needed to catch a break, suga would stare at you.
Seeing the concentration on your face. The way you bit your lip or your brows furrowed because something just wasn't right, made his heart full.
You weren't even aware just how beautiful you were to him and he honestly just couldn't help but stare. The vulnerable moments are what made him fall more in love with you.
You would always turn your face and catch him looking at you, a smile instantly breaking out on your face, no matter what emotions you were feeling previously.
Then you would always, always ask him, "would you like my opinion?"
Despite the fact that you knew little to nothing about homework you always wanted to help him out. He knew you had other important things to worry about but the fact that you still wanted to help him out would tug at his heart strings.
"Yeah, do you mind?" suga would ask.
"Not at all." You would put aside whatever you were going and move closer to suga as he gently passes the paper to you He watches you the entire time, looking for those little reactions you make to the work that he was grading.
It was always then and there that he would think to himself that he wanted to spend the rest of his life with you.
