拿鑰匙來 Fetch the Key and Sweep the Paths
那妖精十分歡喜道：「妙人哥哥倒有些興趣，我和你去花園裡耍耍。」叫：「小的們，拿鑰匙來開了園門，打掃路逕。」眾妖都跑去開門收拾。那妖精十分欢喜道：「妙人哥哥倒有些兴趣，我和你去花园里耍耍。」叫：「小的们，拿钥匙来开了园门，打扫路径。」众妖都跑去开门收拾。
逐句解 Line by line
The fiend was delighted. "Darling elder brother, you have some taste after all. You and I will go and amuse ourselves in the flower garden."
Her pleasure is that he has shown an interest, which is exactly what he intended. 倒 is dào, the on-the-contrary reading — after all, contrary to expectation — and 興趣 is a taste or interest in things. She thinks he is coming round.
She called, "Little ones! Fetch the key and open the garden gate, and sweep the paths."
The orders are those of a hostess receiving a guest she wants to impress. A locked garden with swept paths is an expensive thing to keep, and she is showing it off.
The fiends all ran off to open up and put it in order.
Nine characters of household bustle. The staff have been doing nothing but clear up smashed crockery, and now they are sweeping a garden.
She takes the bait completely and reads it as progress. He has shown taste; he wants to walk with her; the marriage is going well. Every step of the trap is something she welcomes.
The garden itself is about to be described at enormous length, and the sweeping is the cue. A Ming reader would know that a locked garden opened specially, with the paths cleared, means a set-piece is coming.