#And Toshinori will keep AFO in check to prevent you from getting vaulted

[aimportantdragoncollector]

As long as my AFO is adored and loved then I think it's okay if he retires from villainy to be with Toshi.

But I'm curious will AFO as Toshi ages will AFO just stick a immortality quirk in him or just let him age out and die?

If he does the former won't Toshi realize something's up when he stops aging?

In The Attraction of a Hero to a Disaster, AFO definitely fell for Toshinori hard enough to slip him an immortality quirk. Toshinori will think that it's just one of the many quirks hidden inside One for All. Perhaps none of the past holders lived long enough to realize they were immortal. Since All for One also secretly gave Izuku an immortality quirk, this seems like the logical conclusion. As for Hisashi's curious lack of aging? Clearly the DNA transfer from them having sex somehow passed over a small part of his quirk, the longevity. Toshinori will even apologize to Hisashi with tears streaming down his cheeks for accidentally cursing him with immortality without getting his consent first.

The depths of Toshinori's denial should not be underestimated. He's super committed to never noticing anything wrong with his beloved Hisashi. Izuku is way less gullible and will figure it out. Then Izuku blackmails his dad to make copies of the immortality ability for everyone Izuku cares about or get the lid blown off his secret. (Yes, AFO is going to get stuck with his ex-wife living forever. A fitting punishment for going around forcing immortality on people.)

Also don't give up on having AFO for yourself so easily, there's always the triad option. A true simp would simp to the very end!