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I wonder if anyone has used a penis pump to get a “chubby” in order to make it easier to inject trimix? When flaccid I find it difficult to pick a good injection point, and have had a couple of misfires. I was thinking that a cheaper vacuum pump from Amazon would fluff me up and give a better target. No interest in cock rings, just a chubby.

Yeah, there's been a few guys that have reported success fluffing with a VED before injecting. As cheap as most novelty/sex shop pumps are I guess you don't have much to lose. Just be reasonable with your pumping as it is possible to cause damage if you're reckless.