How Could One Will Cause So Much Chaos?

Newly emancipated 15 year old Harry Potter decides to get out of Britain for the summer and head to Vegas for his vacation, bringing along Tonks and Remus to keep him out of trouble. Two days later Harry wakes up in a hotel room in bed with Tonks and two mystery women,Remus is missing, and next to no memory about the last two days. What happened? This story will have a harem.