by Milhouse1688
If dad gives you oral sex you should force him to give you his cock up your vagina.
After he has pumped in & out for a few strokes her will be unable to stop, so you must lock your heels behind him & prevent any early release.
Once the sperm begins to boil in his ball sack there is little chance he would want to stop - & both of you will experience the joy of his cock head rubbing across the ridges of your pussy.
Bingo ! Ejaculation deep within you.
There is no going back - you both will repeat this regularly, with the risk that your fertile time will cause your egg to be fertilized & your pregnancy begin.
I well watch for her next offering I hope she will relate the story of how she offers herself to him.