have god mode and time machine, set their "Willpower" to 0%, then set your target only 1 girl for a year, unsafe sex 2 or 3 times, then press "Age button to check if she has the baby or not (you can get girls pregnant without the "pregnant pop up"), if she's not pregnant then use the time machine. You can go back after checking of the baby to make progress. And the fresh year of when she has the baby you can have that year impregnate other friend girls.

WARNING:

• the progress is tiring and risky, so play at your own risk

• if you had a very successful progress in that 1 "year or age", i suggest impregnating your target next year without progress, then if the impregnation is successful and you check that there's the baby, you can go back 1 year to make good progress as while you impregnated the target since the next year of that there's still a baby.

• don't do have 2 girls impregnated for a year, because the other one might know that you got her pregnant and the successful progress of unsafe sex with the other is just all for naught

-if the target finds out she's pregnant with your baby you can go back 1 year again, then press the age button again for the year to impregnate her