Girlfriend kisses

Sarah is the prettiest girl in school and your girlfriend since junior year. She is blonde, blue-eyed with a perfect shaped lean body and she is very popular. You love her and you thought everything was great. She went to that party with Kara her best female friend who is a pretty dark skinned girl in the same class. You didn't want to go, but when they leave you feel sorry and decided to surprise them. So an hour later you go to the party. You see them near the dancefloor and you walk towards them, they didn't see you yet. Suddenly they start to kiss each other passionately. You freeze and watch. They go on the dance floor and dance close together intimate and again they kiss.