1: You're an escaped soul on the run when she catches up and makes an offer. Bang her or get turned in.

2: Out for a walk when a portal to the underworld opens. Creatures of many kinds come out when you encounter her in heat.

3: You're a servant of the underworld and it's your turn to take care of her. She's happy to see you as she tackles you and ends up in a suggestive position.

4: Make it up.