You can try out Vi on Gildenmere/Myrellion
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for her "Potency Test" over and over and over to increase your Cum Multiplier and become a firehose.
Alternative if money ain't an issue you can buy Mino Charges from Gene
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on the same city/planet and become the ultimate cum-canon (miiiight need to go to Uveto and buy a few Uthra+ from Dr.Lessau
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to fix your Refractory rate however, get it down to 3, maybe 2 to avoid getting full balls every 2 hours or so lol.)
My own personal TF walkthrough tends to be:
1) Nuki Nutbutter-Lerris at the TamaniCorp shop on Tavros Station (Just 1. Unlock "Nuki Nuts" Perk, it'll be useful later, SPECIALLY since your ball size limits your cum overall so by making it flexible you can REALLY go crazy later on.)
2) Laquine Ears- Jade at Fur Effect in Tavros Station (10 or more. Unlock "Musky Pheromones" Perk & combined with Nuki Nuts makes you cum gallons, VERY usefull to just get milked while you train in New Texas, raise all your stats and unlock Tamami's Breedwell center.)
3) Fertite+ Pills- Lerris at the TamaniCorp shop on Tavros Station (As many as needed. Raise virility until 12.000% or higher, this makes it so when you're milked in Breedwell Center you can get as much as 500.000 credits EVERY DAY ON A SINGLE MILKING!)
4) Chill Pill-Vending Machine on Tavros Station (buy as many as you need to get your libido back on track after having become the multi-millionare cum-cannon.)
5) Mino Charge-Gene on Myrellion (600 to 1.000 to increase Cum Multiplier & Cum Efficiency to kingdom come, now you can literally shoot GALLONS on "empty balls.")
6) Uthra+-Doctor Lessau on Uveto (10 or more, use it until your Refractory Rate= 300% to 150%, ALWAYS save before doing so as it can lower the other cum-related stuff you don't want touched, the thing you wanna lower is Refractory Rate so you can spend days before being immobilized by your full on Nuki sperm-tanks while still being able to shoot FLOOD-LEVELS-OF-JIZZ on your "empty balls" lol.)