"You know, I have to make you suffer at least a little bit to make it look more real. Mistress Stella would get pretty upset with me if she'd found out that I disobeyed her."
"S..s..sure mistress, please"
"Yeah, just like you I don't want to end up in chastity again. Do you want see me in chastity again slave?"
"N..n..no mistress"
"Thanks slave, looks like we're in this together now, keep stroking like that."