Did you come close to cumming? Good.
With the dildo still in her butt, go to her mouth and order her that she licks it.
Ask her that she has a choice now. Deepthroat your cock for 5 seconds while you count, or continue fucking herself with the dildo for a long time.
If she chose fucking, so be it.
Else, go on and give her a nice long deepthroat.
Make sure to give her a nice sloppy kiss after.