Which chapter is that mentioned?
Well, i guess it's obvious how it's gonna end: the MC will wait for her to be 22 and retrieve her memories and them will stay with her (probably the very last page is her remembering him)
Meaning she just foced him to be single for 12 years even after making every single loli in school to fall for him, meaning she ultimately cockblocked him from ever doing anything with any girl...ohh well, then again this is a teasing manga so it was kinda obvious that sadly there would be no loli sex.
I just hope that after this one finishes Uran makes some more doujinshis, i want to see some loli action besides all the teasing as well.