Multiple Syahata's Tutorial:
1. Go to the Sewers where the Tentacles are.
2. Get pregnant and give birth to the Tentacles/Flies (You have to give birth at the entrance to the save room with the Fuel blocked by Tentacles for me, the "Tentacle Wall")
3. Wile invincible interact with the "Tentacle Wall" and wait for it to be finished
4. Have fun
Note: If you want to get your sex and semen count really high, then do the glitch!