5, zombies

https://www.youtube.com/watch?v=cPNqT1ruS9g

Wishing for an adventure, Gerald never expected his classroom to be suddenly overrun with zombies, making things a lot more ideal when he quickly discovered his human abilities had transcended physical limits, making him the fasted, strongest and smarted human in the world. Making things even better, he awakened several systems after completing various achievements, such systems including:

• Zombie Slayer: Allows Gerald to grow stronger for every zombie he kills (Unlocked when he smashed a zombie's head after cutting it up)
• Warlord: Grants Gerald the ability to declare a domain as his own and awaken various status effects, increasing the territory with every conquest of contested areas (Awakened when he saved the beauties and demanded sexual favours or else he would leave them)
• Related Ancestor: Increases Gerald's power every time he cums in a girl and increases that by 10x every time they get pregnant and increases it further by 30x when the baby is born (Unlocked after Gerald created his own harem/orgy)
• Zombie Fucker: Tames and increases the intelligence of infected every time Gerald cums in them (Gerald got this when he fucked the quiet school-girl milf nerd who had been held back several years after it bit him but did nothing thanks to the immunity he got from the Zombie Slayer system. In anger he fucked the zombie with all his might, letting his wives watch as he fucked her tender and still delicate flesh which hadn't been ruined since she got infected via contaminated food.)

Rewards include:

• Superhuman gene
• Zombie immunity
• The ability to improve his powers
• 100% impregnation rate