Good point. I do like for a little cum to leak onto her breasts, though. Especially when it's another guy she's blowing. Gets me harder and ready to fuck her next.
Well you are lucky that if you can actually cum in her mouth .. I like 50/50 swallow .. some drooling out .. swallow some .. then finish by kissing .. if a woman swallows too fast / too much there is no high volume cum kiss after