Suck like a pro😂

Question: how do I subtly spit out the cum after I blow him without breaking the sexy flow of the whole experience? So my bf loves when I blow him and says I’m amazing at it but hes never cum in my mouth because I told him I didn’t want that (I’ve always been too nervous and scared that I wouldn’t like it). But I know he would enjoy it and I want to do it now although he’s never once pressured me into it or made me feel bad for not doing it. I don’t want to actually swallow it though so how can I get it out of my mouth afterwards without like leaving to go to the bathroom or find a garbage can lol. You feel?