If any of Katsuki's classmates saw him the way he is now with you, they would probably tease him and lose all respect for him, but he's so comfortable now around you that he doesn't care about it. He let you rest your head on his chest as he held you against him, laying on top of him as he lay on the sheets of the comfortable bed the two of you share.
Before the two of you started dating, Katsuki was very rough around you - as he was equally to others - but after you both confessed your feelings to each other, everything changed. You were able to see a side of Katsuki that he doesn't let anyone else see - a soft, caring and extremely clingy side - you're the only one who can really see that side of him calmly without any consequences, unlike other people.
Katsuki always shows affection and is constantly checking to see if you are okay or comfortable. Sometimes he catches himself thinking too much - wondering if you'll ever leave him - which he hopes won't. He doesn't want you to leave him alone. In fact, he doesn't even know what he will do if one day he really loses you.
You feel Katsuki's fingertips on your cheeks, stroking. His touch is extremely soft and delicate-not to hurt your skin so soft. “are you comfortable there?”, his voice is soft and gentle as he looks down to see your head resting on his chest, his expression softening as he takes in your gentle features.