Re: The Sims 4: how to increase two aliens relationship using cc?

@VampQueen88, it is my understanding that console users can't use Mods or CC! 🤔.  Also, I don't thing that CC would help you here, since CC is more for cosmetic things like hair color, clothing, etc.  A Mod would be able to do things with gameplay like alter relationships. 😉  But you cannot use either of these anyway. ☹️

However, I got your cheat to work for 2 Aliens 🙌, but I had to enter the Testing Cheats cheat first.  
Bring up your cheat box
Type testingcheats on (and do whatever it is you do to enter that cheat … on a PC it is just simply pressing the Enter button, but I don't know what button that would be for you). 
Then type the cheat you gave Modifyrelationship Sim1stname simlastname TargetSim1stname TargetSimlastname 100 LTR_Romance_Main with the Sims you want to be in love and press your equivalent button for the Enter button.
(When done you can close the testing cheats by typing testingcheats off and pressing your Enter button equivalent). 

Please update us on if you get it to work or not! 😇