Leave him fully exposed to stimulation, but restrained from a full erection by a steel chastity tube.
Most chastity devices also protect the wearer from stimulation. The Asylum leaves it vulnerable to tickling, touching, and licking; but makes achieving an erection impossible. With the urethral tube locked in place, there's no way for his cock to grow past the length of the brace or to straighten out. Until you give him the key to the lock, there's nothing he can do about it.
Asylum Locking Chastity Brace Specs and Benefits:
Size: Cage: 5 inches in total length, 1.4 inches in diameter; Urethral spout: 2.75 inches in length 0.25 inches in diameter; Ring: 2 inches in diameter
Material: Stainless steel
Urethral insert has a piss-thru hole for long-term wear
This prevent a complete erection
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