Find the perfect size

My wife and I need advice on what size Bad Dragon to buy. My wife and I have been increasing our sex drive and desires. She and I were interested in getting a bad dragon. She loves the feeling of being stretched and I absolutely love doing this for her. She can now hold my hand (in the same position as the fisting dildo) and enjoy it while I clench it into a fist inside her. She also liked the feeling of pressure on her cervix. Any advice would be greatly appreciated.

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