Part of Oliver wanted to smirk at the comment from Fifth Element, but the overprotective brother was the part in charge right now. If he weren't his baby sister's boyfriend he probably would've liked the guy. For God's sake, he was wearing a Firefly shirt and nervously quoted the Fifth Element. He didn't want to be the kind of brother that did things like intimidate his younger sister's boyfriend, but then again, she had never had a boyfriend before.
While his mind did its best to work through all of this he was caught somewhat off guard by his own girlfriend leaping into his arms. That actually did bring a smile to his face as he held her returning her kiss.
Katherine made a sigh of relief as she got to her feet and walked over to Mal. "He's really nice," she assured him, "He just has to get to know you is all." Katherine was glad Emily had come over that morning. The distraction would probably help her brother get over whatever big brother issues he was having. Maybe they could all go see a movie and get some ice cream or something. Go to the park maybe? Ollie always loves skating.