Your idea

"Hey guys I'm gonna let y'all have a lot of ammo how about it" you said and they then shouted yes. You then proceeded by doing a couple of hand signs making them have a lot of cum but also making their dick more sensitive but they will still have the same type of cum they usually have just more of it. You then continued your handjob with your completely soaked panties and your tugjob.

"I'm gonna cum now" said the one you were giving a blowjob to. You quickly stopped your handjob and tugjob and opened your mouth while looking at him "Give me all your cum put it in my mouth and put the rest where ever you want" you said as he fapped so fast that his hand was a blur and then he pumped out his cum like a fire hose. He filled my mouth completely and then came all over my cheeks. You turned around so everybody could see his cum in your mouth and then you swallowed showing everyone that too. you continued this pattern and then it was done to the last gangbang customer