The limit we once never crossed

The story features Gojo, who is currently in his 28s and Megumi, who has recently been de-aged by a first grade curse.
This comes crashing down Gojo's walls because the age Megumi is now is the same age he had when they first met in the past.

To top it all, buried regrets towards the evolution of their relationship and that he has kept within himself, resurface, and he can't seem to manage in a way he doesn't hurt.

Disclaimer:
I don't own any of the characters or the series they are from.

Just in case, this is not a ship story. My intention with it is that it's just being self-indulgent with the dynamic of Gojo being Megumi's parental figure.