
If there were more chapters to this story:
*A few months later*
Cops and Yakuzas: *breaks in the house and find all three of them cuddling*
Cops: FREEZE, you're all under arrest.
Aya: How the hell did you find us?
Yakuzas' Boss: I know some people who have access to the satellite camera.
Ryo: *cries*
Ai: 'So much for saying "I'm looking forward to whatever future I have."'
And so, all three of them gets arrested. Aya and Ryo get sent to prison, while Ai is sent to the detention center for questioning.
What a sad ending if I do say so myself

I mean Yuusei could had handcuffed Ryou here -> http://www.mangago.zone/read-manga/encirclement_love/nbt/mpn_chapter-2194148/pg-4/ but whatever. It ended up well in such an erotic sexy way ლ(´ڡ`ლ)
This is just an idea, so I'm not sure if this is possibly true but since all for one can steal quirks, one for all can also steal quirks. However, the original owner of one for all didn't want to steal people's quirk, so he made the rule: if you give someone one for all by giving them your dna, they will receive one for all, along with your original quirk. So basically, instead of stealing quirks, the power one for all copies the quirks from previous owners and makes it its own, and waited for someone necessary to use those quirks, which happened to be deku