You may be plump SpeedoStocky but you can still be desirable and since you are staying at your parents holiday home you may be quite young. You enjoy swimming in your Speedos as you have every right to do, while he is happy to walk around his front garden some distance away from you. You are having an effect on him that he doesn't want you to see close to, so he covers up and wears something big and baggy. Be flattered but decide how you feel and what you want before suggesting he swims in his speedos with you as you may see a physical sign of his appreciation.
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