katsuki grabs shouto's hand and kisses it, just because

katsuki picking up shouto for a charity event and being utterly stunned with how beautiful he is, slowly taking his hand and gives a gentle kiss

katsuki pressing kisses on shouto's hand to let him know he's there for him

shouto giving katsuki a tender kiss on his shoulder and a soft good morning

shouto surprising katsuki and giving a quick kiss on his shoulder when they crossed paths during patrol

shouto placing a firm kiss on katsuki's shoulder after a villian fight to reasure him he's alright