I see that the other girls have prepared you well. You look almost ready to blow your load.
But you better hold it if you really want to enjoy it.
Now get to the edge and prepare to hold it.
By this I mean that you will slow or even stop stroking just at the edge of orgasm but you will let the pressure down only slightly before you stroke again as much as you need to to keep yourself one stroke from cumming.
Do this now. Edge and then continue.