Larger dildos

My girlfriend and I are trying to use an 8″ circumference dildo. It’s the merci perfect cock 10″ by doc johnson. It’s a little too big for us at the moment 😅. Our next size up is a 5″ circumference one. Can anyone recommend where to find 6″ and 7″ circumference dildos to slowly climb the upper steps? We’d prefer to use them with a harness, currently we have the vac u lock variety. Thanks!

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