Approximately 1 week after the new house is built, entering the house will trigger a cutscene with Pam, during which the player may choose from 2 dialogue responses. One will not affect friendship, and the other will cause the player to lose 1000 friendship points with Pam.
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Once the player has reached 9 hearts with Pam, (and at least 4 days have passed since the new house was completed), entering the house will trigger a cutscene with Pam, during which the player may choose from 2 dialogue responses. One will not affect friendship, and the other will cause the player to lose 1000 friendship points with Pam.