Patrick Erlandsen, 20, was working at The NOW Massage when the incidents occurred July 2 and 7, the Loudoun County Sheriff's Office said.
Erlandsen tried penetrating one victim with an object and sexually assaulted the other, authorities said.
He was charged the day of the second incident with two counts of Aggravated Sexual Battery and one count of Attempted Object Sexual Penetration, the sheriff's office said.
Anyone with information is asked to call police at 703-777-1021.
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