That's why Saavik can't look Spock in the eyes at the end and looks down instead!
Maybe a little Romulan shame from applying the Vulcan principle of "The needs of the many outweigh the needs of the one?" Saavik saved Spock's life at the cost of her own shame while doing so? (But, yes, I agree the pon farr thing is hard to explain if
Spock was Saavik's father.)