Looking for a reasonably flexible/comfortable chastity cage…

My partner and I have been exploring the D/s aspect of our relationship, which has been mainly focused around pleasure domination and gentle domination. We’re interested in trying adding a chastity cage to the mix while playing with his ass – I’ve seen videos of people being caged and cumming and it looks really great. My partner is slightly above average, about 3.5″ when soft and 7.5-8″ when hard, so most of what I’ve seen online look like they would be uncomfortably small even when he’s completely soft. Can anyone recommend some reasonably priced silicone cages? Something that would be suitable for someone with a slightly taller build? Something with a bit of stretch so it’s not too painful but still restricts his ability to get an erection? (Within the UK: Delivery and Shipping)

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