Mouth, Pussy or Ass?

Seeing your position, and two hot chicks having sex has made you hard again. Amy is starting to moan from Ellen's tounge lashing so you deside to muffler her with your cock. You step up on the bed and put the head of your cock against her lips. Her eyes open slowly and she smiles as she opens her mouth to take you in.

She sucks you in deeply and takes you to the base of your cock. The feel of her throat is fantastic. You start to slowly pump deep into her throat. Ellen must have gotten friskier because Amy joined you. The feeling was great. You reach down and pull on her nipples. She moans and the vibration goes along the shaft of your cock. You pump faster as Amy seems to want to quicken the pace. In almost no time you are ready to unload again. Where to cum?