Total Obedience
"Keep that speed up, don't you dare slow down slave, try to be consistent. Give those balls a nice squeeze for me while you stroke"
(You do as she says)
"That’s it, up and down, release all those urges. Afterall, I need to make sure you do it properly. Hmm, do you know why your mistress chose me to train you slave?"
(You shake your head while starting to struggle a little with your stroking)
"It's because"..
(While talking to you she starts to lift up her dress)
"By the way, could you stroke a little bit faster for me slave?, please?"
(You speed up even more while staring at mistress Stella, fighting against your now faster approaching orgasm)
"It's because i'm an expert in handling boys who can't control their little cocks in front of their mistresses!. You see, whenever a mistress has problems with their slaves who can't seem to keep their sperm in their balls, they send them to me. Yeah, and everytime when i'll send them back, they appear to be deeply changed. I'm gonna make them ache so much so that they literally lose their minds by the end of it. They always learn their lesson when they're with me, one way or another.."
(You try to plead with her)