Why my boyfriend pick me up And kissed me in the elevator?

We were watching a movie at his house, it was a special day, it was our 6month of relationship anniversary, so we were in the living room watching movies , sometimes we were making out so much that when we stop our hearts were beating so hard, And then he introduce me to his mom and older sister. They were very nice, but i was nervous And my face was red a little bit, then i told him that i have to go, he pick me up, push the bottons of the elevator And inside the elevator he pick me up, laid my back against the wall of the elevator And kissed me so passionately? While i was giggling, i was very happy. What does means he picked me up And kissed me in the elevator?
Why my boyfriend pick me up And kissed me in the elevator?
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