Eh, that doesn't really fit with my story line, as that would require me to repeat a joke many times (which if you haven't notice I don't really do if at all).
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why not make a nonsensical potion alternative like having the mc's cum have a tiny but stacking transformative effect like if they take to much of it in or on their body they can grow a dick but unlike the potion it wont go away until they cream the mc? (i mention the mc's cum as you already have it do thigs like healing powers and having a slight aphrodisiac effect)