My Hero Substitutes

What if Eraserhead was too injured after the USJ to teach Class 1-A, and Nezu called on Ingenium and others to be Aizawa's substitute while he recovers? How will this change ripple out and lead to a different outcome? Rated M for content/language. Also, self-indulgent Speedbunny and IidaMomobowl because why not have Class Parents couple fall ass-backward into a poly harem lol