If I had a time machine I'd travel to the future to get a shrinking machine and a portal system. Then I'd shrink myself and crawl into Taylor Swift's womb, I'd set up a portal inside the womb so I can easily bring construction materials and build my base. I would create a barrier at the cervix to keep out any sperm, of course it would have to be floodgate-style barrier to allow for drainage during Taylor's menstruation. Inside the base I will wait for Taylor to ovulate and then collect the eggs, I will use the portal to smuggle the eggs out of Taylor. I'll have the eggs fertilized with my sperm and implanted into African surrogates. The males will be aborted while the females get raised into my army-sized harem of daughterwives. Given my poor genes it's inevitable that some will turn out badly, those ones will be eaten by me and my prettiest daughters. My girls will be trained from birth to imitate Tay in all possible ways. I will lie back as my army of little angels sing me to sleep every night.