Mis(tletoe)understandings (слэш)

Everyone knows if you refuse to kiss someone under the mistletoe, you have bad luck until you give in and finally kiss them.
When Harry and Severus are caught under the mistletoe, Harry sees the horrified look on Severus's face and refuses the kiss, hoping to save their friendship. Severus assumes Harry is repulsed by him and no longer wishes to be his friend.
Can they sort this out before the bad luck puts Harry's life in mortal danger?