Markus is a super senior. He purposely got held back so he could continue to date your best friend. People know he's openly bisexual, but she doesn't. He constantly flirts with you, though. You secretly like it, but ignore it for your friends sake.

You and your friend are eating lunch together when Markus sits between you both. "Hey, pretty, lady~" he says to your friend and puts his arm around her waist.