Self pleasure combined

Does anyone combine masturbation as part of other medical fetishes? For example during exam play my partner enjoys touching herself and and right before she orgasms she tells me and positions herself to receive a butt injection right at the moment of orgasm. She says the mix of anticipation/pain/pleasure release is incredibly arousing

Mostly I masturbate while auscultating my heart or vice versa and the one benefits the other. I'm (still) dreaming that this will happen once I meet a similar cardiophile woman to live our fetish extensively with.

Masturbating while stimulating the anus/prostate/perenium either with a massager or toy can give an explosive and pleasurable climax!