She tries to shrink your dick.

Penny finally hatches her master plan to destroy you when, one night, she comes across a shady website in the depths of the darknet.

One of the banned "miracle ****" it advertised is named "Shrinkacox", and it causes a man ingesting it to suffer shrinkage of the genitalia. Enough doses, and the man becomes a micropenis with tiny balls and no sexual stamina to speak of.

What a perfect idea! Penny thinks to herself as she rudiments over you having just started dating a girl.

To sabotage your love life and self-esteem, she'll render you a micropenis! She orders up a full supply, and makes plans to slip into your food over the course of the week.