#prolonged exposure and having to ally himself with mephisto broke down his resistance to him--leading to them fucking sometimes

[darklysoft]

In my opinion shipping shirou and mephisto is way better and sexier after the reveal that shirou knew him since he was a kid and rightfully hated him.

I think, especially during canon, mephisto is SO old that he has probably done every sex act ever with every kind of person and I doubt there's a lot in that realm that really excites him anymore. BUT he obviously does still fuck and desire people, and I consider shirou to be one of the few (unfortunate lol) people in more modern times to peak his interest in a really nasty way.

Mephisto definitely had other plans for shirou when he took that interest of course, but I'm taking his sexual intent as a given too (and yes, the desire started when he defied him and made a deal with him as an 11 year old kid)...He's a sadist! He definitely took great pleasure in trapping shirou in service to the order and taking care of satan's kids and in general controlling his entire life until he died!!!

They should fuck about it.