He was gonna end up rejected no matter what but this alpha move at least keeps the level of awkward low. Once he's got over rejection may he also find success.
Given the likely price tag on the staff in there "Don't break anything" is pretty simple and expected rule to set to see Mitsuki's potential grow...both in music and ability to rizz all she seess.
Well they are working through first kiss awkwardness with "well we've always been kinda flirty anyway" though might still take a while before they head out on dates.