Promethazine 5ml

Total swing to the right but...
John filling the girls tummy up so that they look pregnant.
Average sperm volume 5ml
Average volume of a child plus sack and placenta at full term 5000ml
John has two days of testi
That's still balls 500 time bigger than a normal roughly.
Now that would be impressive
LoL

Not to be that guy, but as someone with a keen interest in this area, I've actually done nutritionist research and the math on jizz diets and jizz only diets. First off, you're going to need a few supplements because jizz does NOT contain all the nutrients you need for survival. It's one thing to have regular food absolutely drenched in cum. It's another thing entirely to have only cum. Now on to calories and shit. You get on average, around 1-5mL of Semen per ejaculation. The quantity increases if it's been a while since the last jizz, and less if it's been more recent. At 5 shots per day, I'm going to be generous and estimate it at around 12.5mL per guy which actually makes it into the food container. (Some will be lost during the extraction process) Side note, a bathtub takes about 30 gallons to fill, so you'll need ~9000 guys going the whole day to give someone a semen bath, and around 30000 guys if each guy only shoots once. But let's get back to the diet. So you'll need about 18 guys to fill a standard cup/mug with semen. Now think how many cups of protein shake an active young woman would drink each day. And since she's physically active instead of just lying there and getting fucked like a sex doll, she's going to need several cups. At least 6, but I'm thinking more like 12 if she's riding cock all day. But that's proper protein shakes and just for quick estimates. Semen, despite containing protein, is nowhere near as concentrated. If you go with unreliable internet sources there's somewhere between 5-25 calories per 5mL of cum. Assuming a daily calorie requirement of 2400, you'll need 192 to 38 men jizzing full time to keep up with her dietary needs, assuming you catch it all and assuming the 5-25 calories per teaspoon estimate is accurate. If you assume semen has the same nutritional content as a protein shake, a reliable study found about 5g of protein per 100mL. Commercially available protein powder contains anywhere from 20g of protein per 100mL to 100g depending on the purpose. (Diet vs Bodybuilding etc) If we take semen to be 10x more dilute than a typical protein powder shake, you're going to need something like 10x more semen than protein shakes, which means using that set of calculations, you'll need 1080 to 2160 guys jizzing througout the day to provide the necessary calories. You need a pretty large group to pull that off. But beyond all that, you need to take into account logistics. Even if she sucks dick nonstop and hotswaps them as soon as she sucks all the semen out, assuming it takes 5 minutes per guy, that's 12 guys per hour, and at most, 192 guys sucked off per day if she sucks from dusk till dawn with no free time. Actual performance will probably be lower. Also remember that each guy needs to jizz around 5 times to get that 12.5mL and such guys will probably take longer to suck off. So in summary, you actually can't physically pull off the cum diet fantasy unless it's a story about some weird ritual where a whole town comes together (pun intended) to keep one lucky/unlucky girl alive purely on jizz, and most of them wouldn't even come into contact with her personally. Just jerk off into a container and move on. Thank you for coming to my TED talk.