I think instead of r/AskEngineers you should post it on r/SexToys, but I'll just leave an Amazon link here for you.

https://www.amazon.com/LIVE4COOL-Strengthen-Enlarger-Extender-Masturbation/dp/B07FTDHM3Q/ref=mp_s_a_1_7?c=ts&keywords=Sex+Toys+-+Pumps+%26+Enlargers&qid=1649228487&s=hpc&sr=1-7&ts_id=1243839011