Her glands are mutated, so using a specialized collar she can force her venom glands to change the effects and quantity of her venom at will. Aphrodisiac is a FUN one, but she tends to mix that with increased production. Maybe adding in a tiiiiinge of specialized venom to make it harder to orgasm just so that intense arousal and extreme production leads to uselessly jacking off while your balls BALLOON up behind you to creaky, absolutely explosive limits. If you manage to cum then congrats! You now have a problem to keep for the rest of time! Oh, right, her venoms are more often than not permanent, but reversible if you use an antidote later on!