What should have been a relaxing trip to the hot springs and complicated by Kon’s glowing inability to control his self and that Erec is staying at the same Inn. 
If that were the case, 
he should've been feeling it, too.
Si ese fuera el caso, él también 
debería haberlo sentido.
De ser el caso, a él también le habría afectado...
Se esse fosse o caso, ele deveria
ter sentido também.