Blowjobs aren't on the list of options for a cock caged in steel chastity. For my chastity sub Rod who's favourite thing is blowjobs that's a nightmare, but he can still watch, I have plenty of dildos that I can suck and he can look down where his hard cock used to be and instead see another cock above his locked cock, my dildo, getting the blowjob instead. Teased and denied, reminded what he's missing.