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>>108671
This is the perfect method. You should also have her get used to drinking your piss, a good sissy slut should do so every time her master has to pee. Shove your cock straight down her throat and just unload.
Also start training her for double anal penetration. If you're going to eventually whore her out, it's important she be able to entertain hordes of older men at gangbangs this way.
And importantly she should be on prep, because no condoms should ever be allowed to touch that body. It belongs to you and should be bred daily by alpha men.