I saw your earlier stories, thanks for pointing them out! I think this Alex story is my favorite so far.
I would like to see Alex hit in the breasts or belly, but not in the face or crotch.
Against Fiona, it does seem like an even contest (neither one has shown much offence), so if Fiona has the advantage, you may need to hold her arms behind her back, to give Alex the opportunity to take over.