Clarke is unsuspecting as he begins showing Olivia the lingerie samples he's brought over, including measuring her to make sure they fit on her as well. Olivia finds herself still aroused because of Nicole, so decides to seduce Clarke and have a quickie with him while they are alone. As they get it on, Nicole sneaks up and catches them. Turned on, she watches them, secretly masturbating. When Clarke becomes overwhelmed and excuses himself, she pounces on him next. THEY start to go at it too - until ultimately Olivia catches them and they all decide to just fuck openly as a trio.