It's
Twins by Nan Smith.
New quote:
Ralph’s head shot up, and he shoved the papers back into position. “Oh, hi, Clark!” he called, pasting on a bright smile. “I was just, ah, looking for a pen!”
But Clark wasn’t finished with him. He crossed the room in a few long strides, reached his desk, and grabbed Ralph’s head in both hands. He lowered his head and kissed Ralph lovingly.
Tricia