now this makes you a sex god with constant erection.  you are only going flaccid for partizipating in real life or if there are important common rules to consider.
however, flaccid in this case just means the erection gets weaker, just weak enough for pushing it into pants. it leaves you with a proper big, very attractive bulge that you can't get go away.
however, if you are somewhere more or less safe at a more private place, you enjoy ongoing erection with an extreme size and hardness at the limit of health.
And it may take hours until health reasons interrupts it temporarily.
Safety rules only prevent erection if it is against common rules, allowing you to participate in real life.

it's just using you own conditioning, activating it unconsciously, boosting and increasing its power to incredible strength for getting you the hardest, biggest and longest-lasting erection ever, really uncontrollable for as long as it is safe and within the limits of health.