Have a sniff

He leaned towards her crotch and pressed his nose against it, feeling the warmth of her pussy. He then sniffed slowly, halfway though wrapping his hands around her thighs to pull himself in closer. Then he moved up to her ass hole and had a smell of that too. His penis was now aching to join in on the fun.

The door burst open abruptly and Grace's room mate slammed her books on the side letting out an aggravated sigh. Jack snapped out of his sniffing trance and looked at her with his eyes wide open and hands still grasping Grace's thighs. He realized immediately that Sarah was about to go mental.

"Don't say anything!" He shouted quickly, her face looked shocked beyond belief. She was standing there mouth wide open and eyes staring straight at Grace's behind. The door was still open so Jack quickly remedied this.

"close the door quickly" She did so then turned around with the same expression on her face. Just because she couldn't speak doesn't mean she couldn't think, and this was certainly not an ordinary scene to walk in on.