Take 10 seconds for rest and continue stroking again, increasing a bit the pace.
Look my incredible boobs, think the amazing feeling if you could place your hard cock between them. Think how your cock would feel if i could shove one boob against the other, squeezing your cock in the middle.
Finally, imagine to cum plentifull with your cock wrapped between my boobs, imagine the warm cum splashing all over my face.
But you cannot cum. Think on that until the edge and stop.
Now take 30 seconds of relief.