How to reset the mood?

my girlfriend and I have been dating for almost 2 years and for the first time ever her five year old son ( from her previous relationship) walked in on us. She's now in his room trying to put him back to bed and back to sleep. once she gets back in the room with me. I want to try to set the mood again. How can I get the mood right again. or am I out of luck
How to reset the mood?
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