I assume you need 25 LP for that event, but impossible to get as it stops at 20 LP. I have the same issue with Ayesha.
Viewing post in Love & Sex : Second Base comments
"Having trouble with a possible Ayesha bug. I'm told to get to know her better and her love points is locked at 20 but the progress bar is at 80% and I can't make it go any higher".
First of all this is what was being asked about by the one posting the question. Second of all I'm just posting about my experience but you somehow refuse to believe me and only now come around with the information about the bug being linked to the harem.