One of my favorite fantasies is imagining Renamon going into heat, and then stalking some boy such as Takato. He might be walking home from school and she'd be sitting in a tree, flirting with him. Then she'd secretly follow him home and screw him when he least suspects it. Would Rika be in on this? I could never decide. Maybe this "Heat" is interfereing with Renamon's ability to fight, so Rika tells her go take care of it somehow.
The dramatic lighting was something I threw in there at the last minute. I just felt like making a cool lighting effect.