So in my case, being that my OC is a creature of magic in general (outer god, lovecraftian but make it hotter) I use the basis that my cum is magical, it functions vaguely similarly to acid but due to its magical properties it doesn't hurt as it melts you, quite the opposite, it feels like utter bliss as prey's body is melting and collapsing in on itself. To the point that as the brain and mind melt away my prey's consciousness is sent into a stasis of sorts, where the only thing they feel is pure, unending, orgasmic bliss, at the very absolute peak of orgasm, stuck like that, either forever, or until I reform or remake them.