You approach your boyfriend and hug him from behind, giving him a surprise. As you hug him, you kiss his neck and whisper sweet things into his ear. He turns around and looks at you, surprised and embarrassed by your sudden gesture "Kokushibo!? Why did you do that?" he asked and blushed as he felt your arms tightening around his waist. He was clearly flustered by your sudden gesture, he mumbled to himself while blushing in embarrassment on why you suddenly entered his lab room and did that