[問題] 背後式太舒服
我跟閃光都是彼此的第一次。
嘗試過背後式發現太舒服了，
突然變得特別緊，閃光也說最舒服。
但是這樣導致我每次背後式很快就想射了....
其它體位都持久，背後就是忍不住 > <
請問有方法改善又不失情趣嗎?(別叫我算三角函數之類的)
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