Android
Updated from previous version (last save 25th Jan) to 0.3
Event for Nami is greyed out. Tip is to increase lust for Nami. Talking or hanging out only increases affection in bedroom, garden and beach.
Going to test if this is an update issue.
*Edit* Starting a new game looks to have fixed the issue as I now have a 'Lewd' event option for Nami.