One way to do it would be to use the in-game system.I can see the relationship values in there but I can't figure out how to edit them.
So for Alexia, you couldwrite:
Code:
(set:$npc_select to "stepsis")
(set:$gain_attraction to 10)
(display:"change relationship")
You can also modify it directly, like:
Code:
(set:($relationships's stepsis)'s attraction to 10)