I'm trying to finish Aba Daba Honeymoon, but I can not give the drugs to Motor Runner. I've been to Vault 3 earlier for the Still In The Dark quest. I went in and killed everyone, except Motor Runner. Now as I go back, Motor Runner asks me how I got there, and my only speech option is "I was just leaving".
I've tried wearing the simple armour Diana gave me, but it made no difference talking to Motor Runner.
Any tip on how I can finish the quest?