I Try to Deepthroat Balls and Cock at the Same Time but Seems Impossible

I was curious to do a deepthroat and swallow balls at the same time which my friend Anna told me about. I don’t know how to pull this off, can you assist me ? He cums three times in my throat , while I told him not to since I’m allergic. I tried to open my mouth as much as I could but seems impossible to fit this cock and balls at the same time.