Just get them for him, and don't tease him, but encourage him. They are just under clothes, and if its a swimsuit just encourage him, and comfort him, and that will build his confidence.
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It's important to have a conversation with your boyfriend about your desires and preferences in a respectful and understanding manner. Make sure to listen to his thoughts and feelings about wearing a thong and find a compromise that works for both of you. Ultimately, it's crucial to prioritize open communication, consent, and mutual respect in any relationship.