I don't really specify. Nothing is pre-planned.
A blow job always ends with me cumming, of course, but whether she decides to swallow or not is up to her. I generally warn her the moment has arrived, though! Often, she does take a load in her mouth and swallow it down hungrily. Sometimes, it ends in a facial. Sometimes, in a pearl necklace. Sometimes, it's over her stomach and in these instances she'll position herself for us to watch it being 'recycled'
down into her pubes (if she's natural at the time) or straight into her sweet, shaven little slit. Sometimes, it ends with a stream of cum arching into the air and landing...wherever. On me, on her, on us, on the bedclothes...wherever. She actually loves to watch the male orgasm in progress, a look of awe on her face.
I leave just
how I finish up to her.
And sometimes, on the verge of cumming, I'll pull back, flip her over to finish off vaginally or anally. I'll have been brought to the edge of orgasm by a blowjob...but sometimes it doesn't end orally.