Not long.

Kerry gasps "Oh Fuck!" as you deepthroat her. Using your left hand you play with her balls; when you feel her grabbing your head, you know that she's very close to cumming.

Tickling her pisshole with your tongue was the final straw for Kerry.

"OOOOOOHHHHH FUUUUUUCCCCCCCKKKKKKKK!" She groans as she unloads what feels like a bucketful of cum down your eager throat.