Idk why but Kian seems like he would be the type of guy to be playful but also really gentle. Like he will start a pillow fight or tackle you (playfully of course) or msss with your food while your gone but then one minute he will be cuddly and clingy. You would probably be in a lot of his videos and instagram posts. I wouldn't see him as over protective because he trusts you and you would always hang around the o2l boys anyways. Kian would probably do something really cheesy on the first date like dinner and the movies. When Kian does something dumb or annoying like scarecam you can never stay mad at him because he is adorable and would probably tickle you unil you forgive him. I don't think Kian would be afraid to kiss or hug you in public. Your relationship would be open. Sometimes it may not always seem like it but Kian loves you no matter what and would be heartbroken if you guys broke up.
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Hope you enjoyed it!