Stupid blow job question

This may be so stupid but I love sucking my man’s penis but he is always laying down when I do. The last 2 times that we have done it he just randomly stood up right before he was about to nut. My problem is when he stands up I feel like I can’t breathe and that his penis is basically lodged in my throat, is there anything I can try to breathe easier? I tried breathing through my nose but I get choked up.