I can see Ludwig not being too pissed off. He can still find plenty of ways to feel in control/power. He'd ride him and right when he's about to cum he stops, making Franz whine with gritted teeth and pleading wide eyes.

Borys on the other hand would genuinely be upset. After the horrors™ he's overall a little scared of intimacy. And when Franz insists on topping he's just 😦. It just brings out lots of painful memories and he sometimes freezes up, sometimes he starts crying mid sex begging him to stop, some others he just takes it but is quiet all through out much to Franz's horror.

With time I'm sure Borys would become more accepting 😭 but that initial phase will be hard to overcome