Four of the five songs on “Hyperfixated” will already be recognisable to fans. The other is the title track, and it’s the one doing the heavy lifting. It deals with a crush that lives entirely inside one person’s head: a stranger noticed, a whole story invented around them, and not a single word actually spoken. Plenty of pop songs are about wanting someone. Fewer are about never getting past the planning stage. Credit for the song goes to Jessica Mougin, the name behind Jessmin, along with Alexander Haak and Stijn…