In a pleased voice she adds "I might even let you circle my nipples for a while"
"Before I take of my pants off, I need to know you can control yourself"
"Start circling your whole cock head"
"that finger had better be doing whole laps..."
"but I don't want a straight finger....curve it around your cockhead...
"Imagine its my pussy enveloping your engorged member..."
"Start working up a faster pace..."
"If you can prove you can control yourself... I will let you fuck any way you want"
"Do NOT slow down... keep going faster until you cannot take it anymore"
"When you are so close to cumming that you can't take it anymore let go...."
[Continue when she knows your limits]