Three's a crowd.

Carl drew back his fingers, and without warning squeezed three into Steffi's ass.

"Ahhhhhiiiieeee." squealed Steffi. Carl could see visibly she was getting aroused now, there were several beads of wetness running down her legs.

Carl pumped his fingers in and out of her ass, faster and faster wanting to make her cum.

"Carl.. please... the ... thermometer... is..." Steffi breathed. She then grabbed his hand and took it out.

"Carl... stop...." Steffi said. Carl withdrew his three very slippery fingers. Steffi took the thermometer, and stuck it inside her own ass. She pushed Carl off her and went to her en-suite.

Carl was slightly annoyed and worried that Steffi would say something to their parents. Then he realised he was in her room alone...