If this becomes popular there’s gonna be like 500 NTR dj with Mitsuyoshi and Milica. Their interactions are like half the preamble for one already.
Honestly more entertaining than watching default protagonist C interact with flavor-of-the-week-chan too...
Milica has a genetic trait that causes her to catch on fire when she falls in love. In the first chapter, she caught fire (thus destroying her clothes) and started chasing the MC around the school after trying to seduce him. I’m assuming that omake takes pace shortly after she calmed down and returned to her senses.