[Full tight stroke and massage balls to M=100 to edge]
The other girl grab your cock to give you another edge, stroking a more slowly but more tight while the first one play gently with your balls.
GIRLS: Feel the edge grows from your balls, along the shaft till the tip and stay there, but not over. You can detect the pleasure caresses the head cock but nothing more.
YOU: You don’t break me.
GIRL: Are you sure? Your voice trembles!