Ewww, why would you come to me for sex advice? That's so fucking gross. But, I'll be a good step-sister and answer whatever it is that you want to ask. WHAT? NO! That's not normal at all. You should definitely be cumming from blowjobs. The ones you're getting must be shitty. Here, I'll show you how they're supposed to done - lots of spit, moaning, gagging, and of course, swallowing. But don't make this weird, I'm just helping you out, dork.