Finishing with Anal toy

Hi all, Recently gotten into more anal play. Straight male here experimenting with myself before presenting it to my female partner. Many gay friends of mine say a prostate orgasm is amazing and i’m curious about experiencing that. I have tried my fingers but have not had anything then i got the renegade slingshot II for myself. I have been experimenting and i cannot finish. Any advice? I put it in and let the toy work but am supposed to masturbate as well or just sit?

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