"Your honor, technically she's even older than me! You see, she was frozen in a sleeping spell for 30 years that stopped her from aging and the only way to break it was to kis- Wait! No! Don't call the guards! Stop dragging me off to the dungeon! I didn't finish explaining yet! What's this 'FBI' you speak of?!"
Dude was committed to his job bro. He said he would fix things and dove in without hesitation. Man's like a doctor. It's all business with patients.
He really had no ill-intent
Could be you need sm1 of the opposite sex, so kiss him princess. It's for science.
Could be too wide age gap, find sm1 closer in age.
Find common attributes of all 7 sisters + MC first, then form hypothesis, test, verify/disprove and repeat.