It's a bit snug in the pimply teen's gut, but besides that you've got no complaints. You can feel your cock twitching. Despite just shooting your load, it takes you only a few seconds to produce a fresh hard on. You briefly wonder if humping the brainy girl's stomach lining would go against the commonly accepted rules of student-teacher etiquette.
"Rachel, that was... AMAZING." You sigh.

"I enjoyed it quite a bit myself." Rachel replies, in a satisfied voice. Apparently she can hear you despite your location. You hear Nancy make a sarcastic comment, but it's too muffled by Rachel's flesh to decipher. You do, however, hear Rachel's response, "I thought it was cute." the girl defends you, "Not many guys will do that in my mouth. I'm not exactly cheerleader material." Nancy is quick with another negative, undecipherable remark, "Well I never said it wasn't perverted." your nerdy predator admits, a hint of humor in her voice.

You've got a pretty good idea what they're talking about now, "In my defense, you're great with your tongue." You tell her playfully.

Rachel giggles lightly, "Usually teachers compliment me academic achievements or my capacity to learn, but thanks just the same!... Never mind what he said, Nancy. Why don't you go get a soda from the vending machine while we wait? Digestion should start kicking in soon."

You brace yourself for what's about to come. If this experiment is successful males, at least ones employed by the school, won't have to worry about death via teenage stomach ever again. If it fails, however, you're going to be reduced to a reeking pile of nerd shit.

"Rachel? Are my chances of surviving this good?"

You feel Rachel's stomach cave inward. The slimy wall brushes against your half erect member, causing you to shudder. You realize she must be gently patting her stomach. "Don't worry," she says in a reassuring voice, "Rachel and I have really poured a lot of hours into this project, and I double and triple checked all of our calculations, just to be on the safe side. I'd say your chances are very good."

"Thanks, that's good to know." Rachel's words succeed in calming you a bit. You'd assume most girls, especially the stoic, scientific types like Rachel, would just ignore their prey's questions, so you're grateful for the response.

Suddenly, her hot, humid gut starts to mix and churn your form. Bile and digestive juices start to drip onto your shoulders, snake down your back, and pool around you. You take a deep breath, this is it, the moment of truth.