Thanks for the chapter!
Skill's name is off. Shield bash is when bash an enemy with the flat side of the shield, usually by putting full weight behind it and pressing forward like hitting enemy with a car not stabbing them with a blade. Shield Pierce would be better since it's not a slash and is piecing with an extendable blade. In any case, third waifu get for MC. Something tells me that even after the battle day they won't be separating. Although not sure how she'll stop the assaults from her half siblings or cast off her position as princess to go adventuring but should be interesting.