Never

"I never thought I'd get the chance to do this......until your wife told me that you're not allowed to get hard......you're not allowed to touch a woman without her permission!!!"
"Yes....that's true...."
"So I've always wanted a man to watch me when I make myself cum......the boys I've dated don't have the patience.....but you....you really don't have any choice do you?"
"No Ma'am.....no choice at all...."
"So just kneel there and watch......you can smell my panties if you want....they're really wet....."
"Thank you Ma'am!!!!"
"You're welcome Sissy.....now be quiet.....I need to concentrate...."