The Alex fixes Sami event is one hell of a nook. This one is related to following the left hand side of the follow up event when Carla sneaks in. It is definitely a bug in the description because it's missing a condition, which is to not cum inside Alex at another point in the reunion.
This one also has a bugged description It's from hypnotising Jenny to have larger breasts and not Lina.
The Haily one is limited to C4, as she has a different one for C5. Another showing of my poor explanations.