Fairly certain only the player can get this end. The AI cant - its "cum risky" counter says zero in all of my games, even though theyre ending inside almost every time.
you mean between 2 npcs ? i have no idea if the core game can increase the risky cum stat, but the Pregnancy modules do add risky cums for npc-npc sex, but to be fair i have not seen if the preg ending can happen if the preg module gave them riskys.
This infertile global is just effectively giving every card the Infertile module, but you only have to put it on PC (no need to edit all the other cards), deletes risky cum from all cards in the class on sunday night unless you give them an exemption, so PC cant get any preg endings (hypothetically if NPCs can also get preg by npcs in the core game, and they get kicked from class, then this mod also stops that)