Kronii brings you Ollie and Olivia
Ties both instructing you to rape the latter
Any stimulation Olivia suffers is transferred to Ollie, so when you breed Olivia, Ollie will be feeling a Phantom Cock in her pussy and eventually the sensation of a Phantom Creampie which she cannot escape from

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i know it's not abuse but

fucking Ollie
older sister Olivia barges in, telling her to stop being so loud
blushes liek a tomato as she realizes what's going on, and slowly backs out of the room
zombie laughs uproariously, boner ruined
she asks jokingly if you want her to be even louder instead, to show her sister what she's missing out on

alternatively

olivia decides that ollie's not being a proper girlfriend
decides to show her what to do by example
going out on a date with you while ollie follows along, acting all lovey dovey
pulling you into her bedroom when you return to their place, asking if ollie wants to watch this part too
she does
olivia is much gentler than your zombie girlfriend, holding you tight as you part her folds
ollie jokes about her still being a virgin, you panic and look down to see a little bit of blood trickling down
olivia just tells you to ignore it, kisses you passionately
in sharp contrast to the rough, fast sex you have with ollie, with lots of scraping with her nails and biting down on your neck, olivia is slow and methodical
instead of 'fucking', she informs you between moans, this is 'making love'
when you're about to cum, she locks her legs around your hips
whispers into your ear to come inside her, just like you do to ollie
ollie points out that you only do it without a condom because as a zombie, she can't get pregnant
olivia realizes too late as you release inside her, sperm painting her womb white

the contrast between screaming boomer zombie and prim and proper older sister human makes my dick diamons