The swan dialogue...I kinda wished I could have convinced them to go for the 3way. Karlach has quite an appetite and it might be easier to satisfy with 2 people. Also, she has a limited life expectancy. ...but there's the other point. Shadowheart might not be willing to share at that point because/she/ doesn't take you to bed herself yet. Lae'zel beds you act 1, Karlach act 2, but Shadowheart herself is super patient and waits for act 3. Since the other two bed you first, she won't keep you unless you choose her alone. It might be nice if you could invite Karlach for a 3some act 3 though. Particularly if Karlach banged you in act 2.