"Hello again slave. Its me again, Mistress Sunny. Do you remember what I said last time we met? I said that the next time we meet it would be your last task for the day. Well that time is now and the task is of a stroking nature."
"I know you haven't by any means been a perfect slave today but seeing as it was your first day, I'll be kind. If you manage to complete this final stroking challenge, I might just give you permission to cum. I stress 'I might'. No garantees...but you'll have to make it to the end to find out for sure."