This was strange... (Spoilers)
Ch 1 and 5 are a very cute rival to friends ( maybe lovers)
Ch 2 is rape... Rape sold as fluff, wich is even wrost and grosser.
Ch 3 is doormat x asshole and pretty boring
Ch 4 is kinda of weird beeing student x professor, but since they don't end up together i guess is not really that bad.